Tachometer: Description and Operation

How the Circuit Works
The indicator lights come on under various conditions in their related systems. Refer to each related system to see the entire indicator light circuit.

Tachometer
The tachometer drive circuit (part of the main circuit) receives pulses from the PCM. The solid-state tachometer then displays these pulses as engine speed. For each 200 pulses per minute from the PCM the tachometer displays 100 RPM.