1. Ignition (ACC) Wire:
- Locate the ignition (ACC) wire, which provides power when the key is in the accessory position.
- This wire is usually red or orange with a black stripe.
2. Ground (GND) Wire:
- Find a suitable grounding point on the vehicle's chassis.
- Make sure the grounding point is metal and free of paint or rust.
3. Engine Speed (RPM) Signal:
- Since there is no stock tachometer in your Civic, you will need to find a tachometer signal wire that provides the engine RPM information.
- This wire is often located near the ignition module, distributor, or ECU (Engine Control Unit).
- In the case of a 1993 Civic, the tachometer signal can be found on the:
- Distributor's negative (-) terminal.
- It's a white/black wire.
Once you have identified these wires, you can connect them to the corresponding terminals on your aftermarket tachometer according to the manufacturer's instructions:
1. Ignition (ACC) Wire: Connect this wire to the "ACC" or "+12V" terminal on the tachometer.
2. Ground (GND) Wire: Connect this wire to the "GND" or (-) terminal on the tachometer.
3. Engine Speed (RPM) Signal: Connect this wire to the "Signal" or "RPM" terminal on the tachometer.
Ensure all the connections are secure and properly insulated.
After installing the tachometer, you may need to calibrate it according to the manufacturer's guidelines. This often involves adjusting a potentiometer or setting a switch to match the number of cylinders in your engine.
Additionally, since you are tapping into the tachometer signal directly from the distributor, you might experience some variations in the RPM readings compared to using the stock tachometer. This is because aftermarket tachometers may interpret the signal slightly differently.
