How to connect a tachometer to an oka? – Online reference book to help the car owner – we look for and fix faults

Possible difficulties

Oka

The basic equipment configuration on the Oka of older versions does not provide for a tachometer. Accordingly, there will be no place for it. You will have to carry out installation and fastening yourself. Double-sided tape can greatly help in this matter. Some tachometers are equipped with an additional leg. Then you can simply screw it on using any bolt or self-tapping screw. But still, double-sided tape is more convenient and no less reliable.

The fact is that it is difficult to find a suitable tachometer on Oka. Why? It's all about the number of cylinders. When buying a tachometer, you need to make sure that it supports operation in this mode. This is where all the difficulties lie.

Of course, you can take any device you like and insert it, but it will not be able to display the readings correctly. To do this, you will have to perform several simple operations if you have the skills of an electrician. Or you can just go to the workshop and, for a small fee, the masters will do everything. At a minimum, a lot of time and nerves will be saved, and most importantly, the tachometer will not be damaged.

Tachometer on Oka: what is it for and possible connection methods

Do you need a tachometer on an Oka car? Certainly! At the very least, its presence will not harm, and its presence will be useful for both an experienced driver and a novice who has just gotten behind the wheel of a car.

Possible difficulties

Oka

The basic equipment configuration on the Oka of older versions does not provide for a tachometer. Accordingly, there will be no place for it. You will have to carry out installation and fastening yourself. Double-sided tape can greatly help in this matter. Some tachometers are equipped with an additional leg. Then you can simply screw it on using any bolt or self-tapping screw. But still, double-sided tape is more convenient and no less reliable.

The fact is that it is difficult to find a suitable tachometer on Oka. Why? It's all about the number of cylinders. When buying a tachometer, you need to make sure that it supports operation in this mode. This is where all the difficulties lie.

Of course, you can take any device you like and insert it, but it will not be able to display the readings correctly. To do this, you will have to perform several simple operations if you have the skills of an electrician. Or you can just go to the workshop and, for a small fee, the masters will do everything. At a minimum, a lot of time and nerves will be saved, and most importantly, the tachometer will not be damaged.

Advantages of a tachometer

Why is this wonderful device needed? its function in an Oka car is to adjust the idle speed. It will be no less useful for beginners who have just started driving. It is impossible to reliably determine revolutions by ear, but with a tachometer you can always know exactly the current value.

It will become easier to select the optimal time to change gears. This means a reduction in engine load, fuel consumption and an increase in vehicle traction power. Despite the almost complete absence of noise-canceling elements in the cabin, there are situations when you simply cannot hear the engine running. For example, when the music is on.

Tachometer Oka

Let's summarize. That's what a tachometer is for.

1. Idle speed adjustment.
2. Shifting gears at optimal speed.
3. Convenience for beginners.
4. Determination of revolutions at any time.
5. Fuel economy.
6. Reduced engine wear.
7. Increased power (due to timely gear changes).
8. Determining speed in a noisy environment.

Connection

There are several different connection types. Let's take a closer look at them.

Cigarette lighter

Connecting via the cigarette lighter to the Oka is not just convenient. This way you can avoid many problems and seriously expand the list of possible options. In most cases, such a tachometer is the best option. It is very popular among car enthusiasts.

First way

To connect, simply insert the plug into the cigarette lighter socket. This will not require any actions, adjustments or additional operations. You will only need to choose any convenient place to install the tachometer.

Note

This attitude has several negative qualities. The readings will have a relatively large error. Disguising the wire between the cigarette lighter and the display will be problematic, because it will create additional inconvenience.

Method two

Here you will have to tinker a little. In this case, the same connection to the cigarette lighter is made, but soldering will be used. The procedure is as follows.

1. We remove the cigarette lighter from the socket.
2. We expose a small part of the wire near the cigarette lighter plug (on the tachometer wires).
3. We run the tachometer wires behind the dashboard. So that they do not hang out on the front part.
4. We carry out soldering, taking into account the polarity.
5. We return the cigarette lighter to the socket.
6. We fix the tachometer on the dashboard in a convenient place.
7. We fix the excess wires in any convenient way.

Everything is very simple. Advantages over the first method:

• no hanging wires on the front panel;
• error reduction;
• releasing the cigarette lighter socket.

Installing a tachometer on the eye

For a long time I wanted to install a tachometer from a VAZ 2106, after purchasing a tachometer I began to collect information on how to connect, what needs to be connected where. For accurate operation of the tachometer, you need to solder a regular 0.22 MicroFarad capacitor, parallel to the original one. in general, there is nothing complicated, but the result pleased me, I made the backlight from a 10 cm blue light diode strip. I put it in a coffee can and pulled it from the outside with a carpet.

Connection diagram below!

I was always annoyed by the hole in the rear bumper, so to cover it up, I decided to install a rear fog light and connected it to the brake light)) now it works as an additional stop))

I missed the speedometer light all the time at night. I tried putting different light bulbs there and installed one blue diode and a white seven diode, but it refused to burn for a long time, and it was decided to install a 25 cm long diode strip. The light is not bad at all, it doesn’t interfere at night.

Do you need a tachometer on an Oka car? Certainly! At the very least, its presence will not harm, and its presence will be useful for both an experienced driver and a novice who has just gotten behind the wheel of a car.

What is the signal going to the tachometer on the Oka?

The tachometer in a car is used to indicate the number of revolutions of the engine crankshaft. Let's look at why the tachometer doesn't work and how to find and eliminate the cause of the breakdown. We will definitely dwell on the device and principle of operation, which will help to find out why the tachometer stopped working, the needle twitches or behaves inappropriately.

Classification by operating principle

• Mechanical or electromechanical tachometers with direct drive. The revolutions are transmitted to the dial indicator through a flexible shaft, which, through a worm gear, receives rotation directly from the crankshaft or one of the transmission shafts. The operating principle of the indicator is based on the phenomenon of eddy current induction. The operation and design of a magnetic tachometer are extremely similar to the operating principle of a car speedometer. In modern cars, a similar tachometer design is not used.
• Electric machine. A distinctive feature is the connection to a generator. It is used primarily on diesel engines, but for the purpose of unification, a device of this type can also be used on gasoline engines.
• Electronic. The signal can be taken either from the ignition system or directly from the computer. Installed on gasoline and diesel internal combustion engines.

Design and principle of operation

Main components of electric machine and electronic tachometers:

• measuring unit, or signal converter. It can be based on elements of analog circuitry or built using special microcircuits;
• display unit with analogue or digital display of the number of revolutions;
• auxiliary elements.

The operation of electronic tachometers is based on the conversion of individual signals or pulses captured from the computer, ignition system or generator into a signal “understandable” for the display unit.

Connection diagram

When looking for the reason why the tachometer does not work, it is first of all important to understand the connection diagram and the type of signal. There are 3 typical connection schemes:

• to a contactless ignition system (the tachometer wire is connected to the primary circuit of the ignition coil). The operating principle is based on measuring the frequency of voltage surges in the primary circuit of the ignition system. Calculating the ignition angle is impossible without focusing on the number of crankshaft revolutions, therefore the sparking frequency directly depends on the crankshaft rotation speed. On 4-cylinder internal combustion engines, a full revolution of the crankshaft corresponds to 2 voltage pulses in the primary circuit. Accordingly, the higher the crankshaft rotation speed, the greater the frequency of voltage surges;
• connection to the contact ignition system. The operating principle and connection diagram are similar to the BSZ, but the design of the measuring unit will differ depending on the voltage of the input circuit;
• connection to the engine ECU. The principle of operation is still based on recording voltage pulses in the primary circuit of the ignition system, but the signal to the tachometer comes from the engine control unit;
• connection to the generator (the tachometer signal contact is connected to terminal W of the generator). The rotation of the generator pulley is carried out by a belt drive from the crankshaft, so the rotation speed of the generator rotor will always be proportional to the crankshaft speed. The change in the number of revolutions of the crankshaft can be calculated by constantly measuring the amount of EMF generated on the winding. By its operating principle, an electric machine tachometer resembles a conventional voltmeter.

Typical faults

If the mechanical tachometer on a car stops working, there is mechanical damage to any of the structural elements. A broken cable of a flexible shaft, wear of the worm gear elements, the appearance of backlashes, deformations - all these reasons can cause the engine speed indicator to fail.

What to pay attention to if the electronic tachometer does not work:

• integrity of electrical wiring. In this case, it is important to check not only the signal wire, but also the ground and power supply of the instrument panel;
• quality of contacts. The presence of oxides and loose contact inside the chips may well cause the tachometer to fail;
• the integrity of the elements of the measuring unit, which are located behind the protective glass inside the dashboard. Among mechanical damage to transistors, burnout of microcircuits, tracks or swelling of resistors, the most common reason for a non-working tachometer is a violation of solder integrity. For example, on the Mitsubishi Padjero II, the appearance of microcracks in the soldering areas of the tachometer elements is a generally recognized disease.

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