Advice 1: How to connect a tachometer to the alternator

The tachometer is often used for measuring rotational speed of objects, for example, to determine revolutions of the crankshaft or generator. Almost all modern car models have a built-in tachometer. If on the control panel of this device is missing or it is defective, the generator you can connect a separate tachometer.
How to connect a tachometer to the alternator
You will need
  • - tachometer;
  • - the user manual for the tachometer;
  • - insulated wire.
Instruction
1
Review the principle of operation of the tachometer. Most electronic and electro-mechanical tachometers read the number of pulses that come to the coil (petrol engines) or with a proper conclusion, marked “W” (in diesel engines). At identical engine speeds the number of pulses coming from the generator is about six times greater than the number of pulses coming to the coil. If you are unsure about the proper selection of the tachometer, check from the seller if this type of for your car.
2
Read the instructions on the use of the tachometer to understand the sequence of actions when installing and wiring the device. The principle of the connection of the tachometer in most cases, the following: wire black goes to ground, red for plus, green for rpm reading of the measured device.
3
If the vehicle is equipped with an electronic control unit, the green wire connect to the contact block, from which the momentum going on a regular tachometer. If the tachometer is not provided by the design of the car, find the contact, from which the output goes to the diagnostic block.
4
For the diesel engine there are special types of tachometers that connect directly to the generator. Look at the alternator terminal marked with the letter “W” and connect it to the input wire.
5
If the specified terminal of the alternator is missing, get her pre-insulated wire. Remove the alternator and disassemble it. You will see three wires extending from the windings to the built-in generator rectifier. To any of them attach the wire and take him outside. Assemble the generator, making sure that the new wire does not concern moving parts.
6
Connect the generator to the rest of the wires leading from the tachometer, following the diagram (see figure).

Advice 2: How to connect a tachometer on the injector

The tachometer is one of the most important devices in the car. It allows you to constantly monitor the rpm level. However, not every configuration is a regular tachometer. So many motorists raises the question of how to connect this device to a fuel-injected engine.
How to connect a tachometer on the injector
You will need
  • - remote tachometer;
  • - new instrument panel with integrated tachometer;
  • - a set of tools;
  • - soldering iron;
  • - cotton gloves.
Instruction
1
Study guide for the repair and maintenance of your car. There you can find instructions for installing and removing standard tachometer on injection model of your car.
2
Find out if a regular dashboard with a tachometer on your car. If any, the most perfect and easiest option is to purchase and install such a Board in place of the one that is installed in your machine now.
3
To install a new dashboard with a built-in tachometer is needed to produce partial or complete disassembly of the torpedo. Each model car has its own characteristics when removing the Board. On some machines it is necessary to detach the whole of the torpedo, and the other just enough to remove the protective visor over the instrument Board, Unscrew the screws fixing the fasteners.
4
To connect a new dashboard required by the scheme, which is depicted in the attached instructions. Don't forget before installing, remove the "minus" terminal from the battery.
5
Purchase and install an external tachometer, powered from the cigarette lighter. Such a device allows you to measure the number of revolutions for changing the current in the onboard power supply system. Remote tachometer, powered from the cigarette lighter is very convenient as it requires for the installation a minimum of effort.
6
However, it does have a small negative error in the measurement. This is due to the fact that each metal its resistance.
7
Connect the tachometer directly to the wires of the cigarette lighter, if you want to achieve the minimum error. To do this, pull out the cigarette lighter socket from the connector and solder the wires from the tach wire coming from the power supply system of the car, observing the coincidence in color.
8
For the most accurate measurement of engine rpm, connect a portable tachometer to the ignition coil. Remove the protective cover from the steering column and locate the bundle of wires. Among them, separate those wires that go to the coil. There should be four. One solder on the "plus" and the rest in accordance with the color of the wire.
9
Contact customer service if you are not confident in their abilities. Install only the model of tachometer, which is recommended for use on your car. Using third-party devices in the best case will lead to incorrect system performance.
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