wiring a tachometer to the coil

• 2023-07-05

The tachometer should refer to an onboard tachometer, which is usually installed on the dashboard of the car's cockpit to display the engine speed. Generally speaking, the wiring of a tachometer is relatively simple, and the following steps can be followed for wiring: 1. Find the positive and negative poles of the power supply of the car mounted tachometer. Usually, the power wire of the tachometer is red , and the ground wire is black . 2. Connect the power and ground wires of the tachometer to the positive and negative poles of the battery through tools. 3. Find the output signal line of the spark plug coil , usually a thick line and a thin line , which are the high voltage line and the low voltage line, and can be found through the vehicle's circuit diagram . 4. Connect the signal wire of the tachometer to the output signal wire of the spark plug , usually green or white.

A normal tachometer is connected to the output end of the trigger coil with blue and white dual color lines, which can be extracted from the magneto line group or connected to the igniter to operate as pulse signals. Remember: A few tachometers are connected to an AC coil and provide a speed signal with a voltage increase as a parameter. Electric starting slipping , replace the starting disc (electric starting clutch disc)! Or it is called an overrunning clutch. Connect the high-voltage primary of the igniter, and the ignition voltage is around 200V . If your tachometer is not designed for high voltage sensitivity , the display will be inaccurate . The pulse signals of the tachometer generally come from three sources : one is the trigger signal , one is the ignition high-voltage primary , and the other is the AC output of the magneto . You can test each one separately and use whichever one is accurate.

According to the working principle of the engine tachometer , the engine tachometer is equipped with three connecting wires. One connecting wire is connected to the DC power lock wire of the ignition switch , one connecting wire is connected to the grounding wire in the cable harness, and another connecting wire is connected to the ignition wire end of the electronic igniter, which is parallel to the ignition wire end of the ignition coil.