Tachometer: Description and Operation

How the Circuit Works

The indicator lights are controlled by different conditions in their associated systems. Refer to each associated system to see its entire schematic.


Tachometer

The tachometer drive circuit receives pulses from the PCM or ECM. The solid-state tachometer then displays these pulses as engine speed. For each 200 pulses per minute from the PCM or ECM the tachometer displays 100 RPM.