The main function of a tachometer in a car is to determine the correct gear, which has a positive effect on the life of the engine. Most cars have an analog tachometer built into them during assembly. The driver looks at the arrow approaching the red line and knows when to shift into a higher gear. Not all cars have the type of device that satisfies the owner, so you just need to figure out what they have and how to connect the tachometer.
- Types of tachometers
- How to connect a tachometer via the ECU
- Connection diagram for a tachometer on a gasoline engine
- How to connect a tachometer to a diesel engine
- How to check the tachometer for functionality
Did you know? The term “tachometer” comes from the Greek
τάχος - speed and μέτρον - measure.
Types of tachometers
There are two types of tachometers: digital and analog. The first looks like a small screen on which the driver can see all the data he needs while driving. The second one is simpler and looks like a board with arrows and values.
Remote
A remote tachometer is installed on the front panel of the car. For greater ease of placement, this device has a leg for mounting on the panel. Remote digital tachometers are good for monitoring idle speed. Their readings have fewer errors, so using such a device you can check the operation of a standard tachometer. In addition, their stylish appearance gives the car elegance.
Staff
The standard tachometer is built into the dashboard of the car. This device is more convenient, since it is easier for the driver to perceive the movement of one arrow, rather than several indicators while driving. A standard tachometer is more often used in cars, and manufacturers of electronic devices produce kits for self-equipping cars.
Important! Measuring instruments are produced according to the car brand. The readings from a non-native mechanism will be incorrect.
How to connect a tachometer via the ECU
If your car does not have a carburetor engine and the injector, the tachometer is not connected to the ignition. In this case, you need to connect the engine control unit to the controller. The connection diagram for the tachometer is simple: take the ground to the body (ground), connect the plus from the device to the ignition positive. The tachometer has two inputs: the first goes to the control unit, the second to the crankshaft position sensor. The device connected to the computer will read pulses directly from the control unit controller.
Connection diagram for a tachometer on a gasoline engine
Before installing a tachometer on a carburetor engine, read the instructions included with the device. If it is not there, install according to the following steps:
- Secure the mechanism in its place (the location is determined by the type of device).
- Connect the black wire to the ground (body) of the car.
- Connect the red wire to the ignition switch terminal, which supplies 12 W during operation of the ignition system.
- The third wire can be any color. Since the ignition system is contact and non-contact, we will consider where to connect the tachometer in both. With a contact system, the device is connected to the distributor breaker. In the second system - to the voltage switch.
If the car has a display backlight, the tachometer is connected to the terminal provided for this in the ignition switch.
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How to connect a tachometer to a diesel engine
Before connecting, let’s figure out what makes the tachometer on a diesel engine work. The operating principle of an electronic device is to read pulses sent by a terminal located in the generator.
Since the process is labor-intensive, it must be carried out in an inspection pit.
The first point of work is to dismantle the protective casing of the generator, try to avoid getting dirt. The second step is connecting the tachometer to the diesel generator. To do this, find the terminal marked “W” on the generator body and connect the device output to it.
Attention! It is imperative to close the contact coming from the oil pump. If this is not done, the tachometer may “lie”.
It happens that the terminal indicated above cannot be found. In this case, disassemble the generator. Connect one of the wires connecting the winding and the rectifier to the tachometer cable. Insulate the wires and reassemble the generator in reverse order. Installing a measuring device is not very difficult, but without any knowledge of how a diesel engine works, how a tachometer works on a diesel engine, without the slightest idea about car repair, it is better to turn to professionals.
How to check the tachometer for functionality
We figured out how to connect a tachometer to a diesel and carburetor engine. Now let's look at the reasons for device breakdowns. You notice problems in the operation of the measuring device, for example, an arrow jumping in different directions. There may be several reasons for the breakdown. If the engine runs for a long time, vibration will occur, which may damage the display. The next reason may be oxidation of the contact group of the electrical wiring, damage to its insulation or disconnection from the tips. These are all visible causes that need to be eliminated immediately. If the sensor itself is broken, it needs replacement. If self-diagnosis does not reveal the cause, you should contact a car repair shop.
Interesting! The tachometer was designed by American Curtis Widder in 1903.
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How to connect a tachometer to a generator
HomeDriving rulesHow to connect a tachometer to a generator
The tachometer is a device that is actively used on gasoline and diesel cars. This device is used to measure the rotation speed (rpm) of the crankshaft or generator. Most modern vehicles are equipped with a standard tachometer straight from the factory.
The need to independently install a tachometer on a diesel engine may arise for various reasons. It should be noted that the tachometer connection diagram on a diesel engine is somewhat different from a similar solution for gasoline internal combustion engines. When choosing a tachometer for a diesel engine, it is necessary to take this feature into account, since a tachometer for gasoline engines will not fit on a diesel engine.
Where does the tachometer signal come from for a diesel engine?
Today, electronic, digital and analog tachometers are available for sale for diesel engines, the connection diagram of which requires a number of features. The fact is that the connection point for the tachometer for a diesel engine in the vast majority of cases is the generator.
To connect to the generator, you must have the tachometer itself, an insulated wire and accompanying instructions for installing and operating a car tachometer.
Connecting the device
The operating principle of an electronic tachometer is based on reading electrical impulses. In gasoline units, pulses are read and supplied in a certain amount to the ignition coil. As for the diesel engine, reading is carried out from a special terminal located in the generator housing.
To connect the tachometer to a diesel engine, it is advisable to carry out work on a lift or use an inspection pit.
At the initial stage, it is necessary to remove the protection from the generator, avoiding dirt getting inside the device. The next step is a visual inspection of the generator coil, which has several terminals.
The tachometer contact (input wire) should be connected to the terminal that is usually marked with the letter “W”.
Also, in some sources it is recommended to additionally implement the closure of the contact that comes from the oil pump.
It is noted that otherwise, after the engine reaches a certain crankshaft speed, a warning light may falsely light up on the instrument panel, indicating a critically low engine oil pressure in the engine lubrication system.
If the terminal marked “W” is not initially present on the generator, then you will need to independently install a separate contact wire. The pre-prepared wire must be properly insulated.
To facilitate access, the generator must be completely removed, as it will require partial disassembly. After disassembly, the wires (3 pieces) will become visible, going from the generator winding to the rectifier, which is also built into the device.
It is imperative to check that during the assembly process the wire brought out does not come into contact with moving elements in the generator structure. Next, the tachometer wire is connected to the contact brought out from the generator in the same way as when there is a terminal marked “W”.
The remaining contacts of the tachometer are connected in accordance with the diagram contained in the instructions for the specific device.
It is also worth considering that directly connecting the wire to the tachometer will lead to incorrect values. Additionally, you will need a divider board, which will make the speed readings correct.
About the DPKV tachometer sensor
The tachometer has a sensor (crankshaft position sensor - DPKV). This device serves not only to count crankshaft revolutions, but also to determine its position at a certain moment, which is necessary for the electronic control unit to ensure proper operation of the power unit. When a metal object passes near the sensor core, an electrical impulse is generated in it, which is transmitted to the electronic engine control unit. The role of such an object in the power unit of a car is played by the crankshaft gear.
Analog and digital tachometers
Car gas tank device and operating principle
A homemade tachometer can be of two types:
- Analog.
- Digital.
The differences are clear from the names. The first convert the electronic signal and output it to an indication device - voltmeters, ammeters, LEDs. The latter convert the analog signal into a sequence of zeros and ones, which are easily recognized by microcontrollers. The latter work with such complex combinations, ultimately converting the original value into numbers on the display.
Analogue tachometer circuit.
Analog tachometers consist of the following main components:
- an electronic microcircuit that acts as an amplifier and analog signal converter;
- wiring connecting all elements of the tachometer;
- scales with a specific graduation, which is applied by simultaneously measuring the rotation speed with a reference tachometer (instead of a scale, LEDs mounted one behind the other can be used);
- an arrow indicating the current value of the desired value;
- an electromagnetic coil on which the axis for the arrow is located;
- a reading device - a breaker (this is often an inductive sensor).
Digital tachometer circuit.
Digital tachometers perform a similar function, but consist of different components:
- ADC having 8 bits;
- a central processor that performs the function of converting an analog signal into a sequence of 1s and 0s;
- LCD display to display the current value of a certain value;
- speed sensor - chopper, must be used either with an amplifier or with shunts, depending on the design;
- a special chip that allows you to reset the current values to zero;
- in cars, sensors for fluid temperature, cabin temperature, oil pressure, speed, and many others can be connected to the CPU.
In the “heart” of the microcircuit, with the help of a personal computer, a certain algorithm is laid according to which the work takes place. The processor calculates mathematical formulas that depend on what parameter needs to be measured. When monitoring one value, the algorithm will be the simplest.
But a digital tachometer in a car can also be used as a temperature, pressure, and speed recorder. The microcontroller has several inputs and outputs. Reading devices are connected to them via buffer cascades - converters and signal amplifiers. But it is worth noting that when introducing additional equipment into the tachometer design, it is necessary to take this into account in the algorithm and software of the microcontroller.
To make a homemade digital tachometer, you will need knowledge of a personal computer and a programming language. The ability to compose algorithms will also be useful. Therefore, it will be simpler to use conventional microcircuits that will amplify the breaker signal and output it to a strip of LEDs or a dial indicator. If there is a row of LEDs, consisting of 10 pieces for every thousand revolutions, then you can determine the current value with an accuracy of one hundred.
VAZ-2110 tachometer connection diagram
- tachometer VAZ;
- trip computer;
- ECM;
- crankshaft position sensor;
- ignition module.
Tachometer VAZ 2110 - with four outputs: if it is on a car with injection, it is connected not to the ignition (input 2), but to the ECM controller with an additional output provided for this (input 1) - and in this case it reads the number of revolution pulses directly from the controller. It receives a signal about the position of the shaft.
Tachometer for a diesel engine, operating principle, types of video
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Unlike other devices installed on cars, the tachometer for a diesel engine is connected through a generator. The device itself is designed to determine at what frequency the crankshaft rotates. In other words, the tachometer shows the number of revolutions over a certain period of time.
You can see the tachometer readings directly while driving; it is located near the speedometer on the instrument panel. Various types of sensors are used to take readings; depending on this, the measurement method can be non-contact or contact. Tachometers are used not only in cars, but also in other devices where control over rotation speed is required.
However, it is in cars that this device has found its widest application. Not a single modern car can do without this device, which allows you to control the operation of the engine and change gears in a timely manner. All this helps to increase service life, contributes to fuel economy, and ensures traffic safety.
There are many varieties of these devices that are used in certain cases.
The very first tachometer was a centrifugal one, where the energy coming from the mechanism is transmitted through an axle. The impact on the arrow in each case is carried out differently, depending on the design of the device.
Tachometer for a two-stroke engine - applications and selection
An electronic tachometer for a two-stroke engine should be considered separately.
One of the varieties of such a device is a waterproof version, used in motorcycles, scooters, snowmobiles and other vehicles with two-stroke engines.
In practice, this is the same as a tachometer for a single-cylinder engine, which determines its service life, as well as the frequency of maintenance, such as valve adjustment, oil change, spark plugs, etc.
Installing such a device on the mechanism is very simple. There is no need for a separate battery thanks to the built-in rechargeable battery. The connection is made directly to the wire of one of the spark plugs. The resolution of such a device is 0.1 hours, it can count up to a maximum of 10 thousand hours, and then reset.
Tachometer dials vary in size.
When a certain number of revolutions is reached, a special flash lamp is activated, after which the gear shifts into the next gear. Such large tachometers take up a lot of space and partially block the view.
Tachometer scale and its additional features
The design of each tachometer in a car provides for working with a specific number of cylinders. The bulk of these devices work with four-cylinder engines.
In some models it is possible to switch to the required number of cylinders.
Depending on the engine speed, the scale graduation has different meanings and can reach from 8 to 11 thousand revolutions per minute.
Certain types of tachometers equipped with a flash can remember the highest number of engine revolutions. The tachometer may additionally include other devices that display engine operation.
Such devices are called multidevices.
Ignition system for gasoline engines
Control of engine ignition processes can be organized by several methods:
- Distributor with one ignition coil;
- Distributorless with a dual (triple, quadruple depending on the number of cylinders divided by 2) ignition coil;
- Individual (for each spark plug).
In all cases, the coil receives a powerful pulse with an amplitude of 12V from a breaker (for cars before the 90s), a transistor switch, or directly from the engine control unit. It is from this point that the signal to the tachometer should be taken.
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What types of tachometers are there?
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Mostly there are analog (in the form of a dial with an arrow) and electronic (display) tachometers. More exotic ones - made in the form of a running scale on gas-discharge lamps (often found on American-made cars), as well as mechanical ones - a legacy of the very first cars.
Mechanical
The very first tachometers installed on cars in the early and mid-twentieth century were devices connected directly to the engine crankshaft.
The principle of operation was quite simple: there was a gear on the crankshaft that meshed with a cable drive, which transmitted torque to a coil, which was an electromagnet of the device itself. The more revolutions, the greater the magnetic induction that occurs, the more the needle of the device deviates. Everything is very simple. However, the measurement error was quite high and could reach values of up to 500 rpm.
Analog
Further development led to the emergence of analog tachometers using a similar operating principle. The difference is that instead of being constantly driven by the crankshaft, the frequency of power supplied to the ignition coil is used to read the number of revolutions.
What it looks like in action. To create a spark on the spark plug, a short-term low voltage pulse is applied to the coil that converts low (12V) voltage to high (from 12,000 to 24,000V). The same pulse is supplied simultaneously to the electrical circuit of the analog tachometer and the electromagnet winding. The more pulses are supplied to the winding, the greater the induction force appears, and the greater the angle the arrow deflects.
It should be noted that the error of analog tachometers can range from 100 to 500 rpm.
Digital
Since digital electronic tachometers are increasingly replacing their analog counterparts, not to mention mechanical ones, we will dwell on them in more detail.
The basic principle of operation of a digital tachometer is to measure and count the number of pulses arriving at the primary winding of the ignition coil, or measure the time interval corresponding to these intervals and convert the received information into digital values displayed on the display.
Video - digital tachometer with many settings and Shift Light:
In addition to the fact that a digital tachometer operates on all of the above values, to improve measurement accuracy, the device also processes values coming from the idle speed sensor and, sometimes, the crankshaft sensor. The 1xbet working website has a fairly wide line: there are about 35 different sports. The painting is also impressive, and, of course, the largest number of events is associated with football. However, for other directions there is plenty to choose from. You should also pay attention to eSports events, since this area is only gaining popularity: there are more and more games, as well as events related to them. Placing bets with 1xbet is not only fun and comfortable, but also as profitable as possible. All data is summed up, and the resulting average value is practically a true indicator.
Since approximately half of the total number of cars (especially compact or small cars) are not equipped with a standard tachometer, electronics manufacturers offer installation kits for self-installation of an electronic tachometer.
A simple set represents, in fact, the display itself, often liquid crystal with a built-in board for processing incoming information and a set of wires for connecting to the standard terminals of the coil (the first cylinder with a distributed ignition system), as well as power.
More complex ones may contain additional idle speed sensors, as well as an external optocoupler. However, such kits are installed for a specific purpose - to gain complete control over engine speed. A simple kit is sufficient for everyday use.
For clarity, below is a typical wiring diagram for an electronic tachometer that receives information only from the ignition coil.
As described above, the tachometer receives the signal from contact K of the ignition coil, which receives low voltage pulses, power is supplied from terminal B of the ignition coil (constant +12V when the ignition is turned on), minus is the vehicle’s weight.
Another version of the tachometer connection diagram - using information from the controller (the “brains”) of the car is shown below.
In this case, to display the number of engine revolutions, information received from the crankshaft position sensor and processed by the controller is used.
Wiring diagram Gazelle 406: device features
Very often, Gazelle owners, when replacing power units from carburetor versions to injection ones, are faced with the need to replace the electrical wiring in the car, since there are serious differences in the electrical circuit.
However, a complete replacement is not always justified, since the repair does not affect other electrical devices except the ignition and fuel injection systems.
As a rule, Gazelle cars produced before 2001 and having carburetor versions of power units require major repairs.
At that time, a 402 engine was often installed, and the Gazelle wiring diagram for the 406 engine, which appeared in the production program of the car plant in 1998, had its own design features that were not compatible with different types of engines.
Operating principle and types
The tachometer receives the signal from the pulse crankshaft speed sensor and converts them into the corresponding numerical value. When using various methods of calculating the control value (direct, reverse, mixed), the reading error reaches 100–500 rpm.
If we touch on the basic diagram of the devices, then in addition to the mechanical tachometer, which can already be considered a rarity, since it is found only on vintage cars, there are two more types of such devices:
- digital;
- analog.
You can also classify devices depending on the installation method:
- standard ones - as a rule, they are installed on the conveyor in a specially designated place on the dashboard of the car;
- remote – mounted outside the dashboard in addition to existing control devices, very often used on sports cars.
Digital tachometer
It is an electronic indicator (screen, display) showing the number of engine revolutions at a given time. It is believed that this representation is most convenient when working with electronic control units or when tuning (tuning) the motor. The device also includes a processor, an analogue to digital signal converter, an idle air valve sensor and another converter that is needed to transform electrical signals into light signals (optocoupler).
Analog tachometer
The appearance of such a device has already been described above. Visually, it is similar to most control and measuring instruments: there is a dial along which an arrow moves, indicating the number of revolutions. The value of the engine crankshaft rotation speed corresponds to the angle of rotation of the arrow relative to the zero value. One of the main elements of such a system is a magnetic coil that accumulates the energy necessary to turn the arrow. The electrical signal from the sensors is supplied through microcircuits to a coil that activates an arrow, which, by its deviation, indicates the value of the control parameter. Sometimes a combined design is used, when in addition to an analog device, a digital one is also installed. However, it is believed that with constant use, the signal from an analog tachometer is perceived by the human brain better than from a digital one.
VAZ-2106 tachometer connection diagram
The “Sixes” were equipped with a tachometer model TX-193. This tachometer consists of:
- plastic cylindrical body with glass holder;
- a scale divided into zones of safe and dangerous modes;
- backlight lamps;
- a milliammeter with an arrow attached to its shaft;
- electronic printed circuit board.
The principle of its operation is based on measuring the number of electric current pulses in the primary (low-voltage) circuit of the car’s ignition system. In the VAZ 2106 engine, for one revolution of the distributor shaft, corresponding to two rotations of the crankshaft, the contacts in the breaker close and open exactly four times. These pulses are removed by the device from the final terminal of the primary winding of the ignition coil. Passing through the parts of the electronic board, their shape is converted from sinusoidal to rectangular, having a constant amplitude. From the board, the current flows to the winding of the milliammeter, where, depending on the pulse repetition rate, it increases or decreases. The arrow of the device reacts precisely to these changes. The greater the current, the more the arrow deviates to the right and vice versa.
Connecting a tachometer in carburetor VAZ 2106
Electric circuit of the speed counter of the carburetor “six”
In a contactless ignition system, the tachometer is connected not to the coil, but to the switch
Connecting a tachometer in injection VAZs
It should be taken into account that the colors of the wires and their purpose may differ depending on the manufacturer of the device, but for the standard “TX-193” device, which is usually used in “sixes”, the diagram is as follows:
- A white cable is required to connect the backlight.
- The red wire is connected to the ignition switch, a fuse is used for this, this cable supplies power when the ignition is activated.
- A white cable with a black break is required for connection to the car body.
- The brown wire connects to the K+ terminal on the coil.
- The black wire is connected to the charging current indicator relay. The latter, in turn, is installed on the right in the engine compartment.
- The gray-black cable is required to connect to the engine fluid pressure regulator installed to the left of the engine.
Tachometer with LCD display on microcontroller
There are two options - buy ready-made, or make it yourself. The second way will be within your power if you understand microcontroller technology and know how to program it. In other cases, it is better to purchase a finished product. Again, it should be noted that the VAZ 2101 wiring diagram will be slightly supplemented. First, you need to connect the tachometer to the positive terminal of the ignition switch. VAZ 2107 Replacing the heater radiator! In this video I will show you how to change the heater radiator on a VAZ 2107 car. Secondly, you will need to ensure that the pulses are read. This can be done in two ways:
- Take the signal from the ignition coil.
- Install the proximity sensor on the crankshaft.
The second solution will be more difficult, since you will have to upgrade the crankshaft pulley - you need to make a protrusion on it that will act on the contactless sensor. But taking the signal from the low-voltage output of the coil is a simpler solution.
Circuit diagram of a simple microcontroller tachometer
But you need to remember that during one revolution of the crankshaft exactly two flashes occur in the cylinders. Consequently, two signals will appear on the low-voltage terminal per revolution. This will need to be taken into account when making a tachometer for a VAZ 2101 with your own hands. VAZ 2105, VAZ 2106, VAZ and toe on the VAZ 2101 it is vertical as shown in. How to connect a 220 volt electric motor. In particular, at the stage of programming the microcontroller, this is necessarily taken into account in the algorithm. Which controller to choose is up to you. AtMega128, which has become a classic, will also do an excellent job. You can find a great variety of designs on it.
To control the actuator (in our case, an LCD display), it is advisable to use an amplifier - a Darlington assembly. How to connect the State on-board computer to a VAZ 2110. This is a small microcircuit that allows you to amplify the signal to the required value. Its price is insignificant, at least 10 rubles per piece, so there will be no problems with the purchase. With its help, the tachometer on the VAZ 2101 will be able to work as stably as possible, and there will be no chance that the output ports will be damaged. Be sure to connect the voltage divider to the input port. It will reduce the voltage coming from the ignition coil.
The module is powered from the ignition switch. How to replace the clutch cable on a VAZ 2109? The error when using microcontrollers can be either 3 revolutions per minute or 50. Therefore, study the datasheets and reviews of people who have used the devices for their designs. The photo shows an example of a circuit that can be used for a VAZ tachometer 2101
. It works stably, all that remains is to program it and install it in the dashboard of the penny. Due to its small dimensions, this will be much easier to do than in the case of installing a six indicator.
Video on installing a tachometer in a VAZ 2101:
GAZ Gazelle Project “Long-length” › Logbook › Pro Mo Tor. Conversion of 406.3 to 406.2
Hello! The topic is quite well-worn, but why not post your version))). I’ll probably only tell you about what’s necessary for this, since if you’ve decided to install it, then there won’t be any problems installing it, but what to buy for remodeling, questions about this often arise. On the one hand, based on the budget of the alteration, you can buy a Volga, remove everything from it and then, if possible, replace all the little things, another way with about the same budget is to buy something large and iron at a disassembly, and immediately buy a new one for any small electrical items , and then not suffer from aging breakdowns.
So, here is my version of what it is advisable to use when remaking:
The intake manifold is 406, well, these are the “horns” themselves.
Receiver, preferably one
why?, because it is larger than the old-style 406, and the motorboat can breathe easier at speed.
The ZMZ 405.22 throttle is like this,
You could also have another one, which has a sensor in the other direction, that’s not the point. The difference between 406 and 405 is in the throttle control mechanism, for this reason the 406 throttle in a gazelle will not open more than 70% (it seems), and the pedal itself needs to be remade.
Fuel rail with pressure regulator and return, nozzles.
An exhaust shaft with a thread and a pin for the RV mark, it is advisable to leave the shaft with a 240 phase, there will be greater thrust from the bottom, these are installed on E3 engines (405.24). I now have intake 252, exhaust 240, from 1800 it starts to feel like the car is moving.
Engine harness, either from Volga 406, or Gazelle 405 E0 (but you need to look for it)
RDV (aka RXX), 405 and 406 are the same.
Camshaft sensor (to install it, you need to knock out the plug from the cylinder head).
The air temperature sensor is the same as a simple temperature sensor, the main thing is red or similar.
Mass air flow sensor with air filter and connecting pipes. Which mass air flow sensor depends on the firmware and the ECU itself, the main thing is that the firmware is for ZMZ 406.2 (Mikas 5.4 is all under thread). More details on firmware here chiptuner.ru
Accordingly, the ECU itself, the choice is usually not great...
electrically, that’s all if the E0 motor is being made, if not, then you may need some more parts, like an adsorber, DC.
An electric fuel pump with a bracket, I advise you to install a more efficient one, or if you buy a new one, then this one
pumps 6 atmospheres, and the performance is high.
Fine fuel filter with bracket.
I recommend installing the ignition coil like this
You need a bracket and an adapter for it, it gives a good spark. The explosive wires are under it.
It seems like everything, not everything, if so, then add)
And finally... Pinout of the Volga harness for an empty Mikas 5.4
and a general view of the adapter for splicing wiring from 406.3 gazelle and wiring from Volga to Mikas 5.4
Addition from DeS-MonD with his permission, connecting a tachometer on an old-style dash, i.e. until 2003. Link to entry.
How to configure, connect and install © 2021 Attention! The information published on the site is for informational purposes only and does not constitute a recommendation for use.
Source
How to connect a car tachometer with your own hands
The main function of the tachometer in a car is to determine the correct gear, which has a positive effect on the life of the engine. Most cars have an analog tachometer built into them during assembly.
The driver looks at the arrow approaching the red line and knows when to shift into a higher gear.
Not all cars have the type of device that satisfies the owner, so you just need to figure out what they have and how to connect the tachometer.
Did you know? The term “tachometer” comes from the Greek τάχος - speed and μέτρον - measure.
Types of tachometers
There are two types of tachometers: digital and analog.
The first looks like a small screen on which the driver can see all the data he needs while driving.
The second one is simpler and looks like a board with arrows and values.
Remote
A remote tachometer is installed on the front panel of the car. For greater ease of placement, this device has a leg for mounting on the panel.
In addition, their stylish appearance gives the car elegance.
Staff
The standard tachometer is built into the dashboard of the car. This device is more convenient, since it is easier for the driver to perceive the movement of one arrow, rather than several indicators while driving. A standard tachometer is more often used in cars, and manufacturers of electronic devices produce kits for self-equipping cars.
Important! Measuring instruments are produced according to the car brand. Indications from a non-native mechanism will be incorrect
How to connect a tachometer through the computer If your car does not have a carburetor engine, and the injector, the tachometer is not connected to the ignition. In this case, you need to connect the engine control unit to the controller.
The connection diagram for the tachometer is simple: take the ground to the body (ground), connect the plus from the device to the ignition positive. The tachometer has two inputs: the first goes to the control unit, the second to the crankshaft position sensor.
The device connected to the computer will read pulses directly from the control unit controller.
Connection diagram for a tachometer on a gasoline engine
Secure the mechanism in its place (the location is determined by the type of device). Connect the black wire to the ground (body) of the car. Connect the red wire to the ignition switch terminal, which supplies 12 W during operation of the ignition system.
The third wire can be any color. Since the ignition system is contact and non-contact, we will consider where to connect the tachometer in both. With a contact system, the device is connected to the distributor breaker. In the second system - to the voltage switch.
If the car has a display backlight, the tachometer is connected to the terminal provided for this in the ignition switch.
How to connect a tachometer to a diesel engine
Since the process is labor-intensive, it must be carried out in an inspection pit. The first point of work is to dismantle the protective casing of the generator, try to avoid getting dirt. The second step is connecting the tachometer to the diesel generator. To do this, find the terminal marked “W” on the generator body and connect the device output to it.
Attention! It is imperative to close the contact coming from the oil pump. If this is not done, the tachometer may “lie”
It happens that the terminal indicated above cannot be found. In this case, disassemble the generator. Connect one of the wires connecting the winding and the rectifier to the tachometer cable. Insulate the wires and reassemble the generator in reverse order.
How to check the tachometer for functionality
We figured out how to connect a tachometer to a diesel and carburetor engine. Now let's look at the reasons for device breakdowns.
You notice problems in the operation of the measuring device, for example, an arrow jumping in different directions. There may be several reasons for the breakdown. If the engine runs for a long time, vibration will occur, which may damage the display.
The next reason may be oxidation of the contact group of the electrical wiring, damage to its insulation or disconnection from the tips. These are all visible causes that need to be eliminated immediately. If the sensor itself is broken, it needs replacement.
Interesting! The tachometer was designed by the American Curtis Widder in 1903.
How to make a tachometer on a Gazelle ZMZ-406
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hutpel
Oleg Pirogov
This trick does not work on all blocks, unfortunately.
USSR USSR
Everything works thanks you saved me friend
