Engine Running

Connect an AC voltmeter to terminal "A" of ignition control module connector. Ignition control module is located on the ignition coil. Refer to IGNITION CONTROL MODULE VOLTAGE (AC) to compare engine RPM and corresponding voltage readings. If voltage readings are not within specifications, replace ignition coil. If voltage readings are within specifications, go to step 2).
Connect an AC voltmeter to terminal No. 11 of instrument cluster connector "B". See Figure . Refer to IGNITION CONTROL MODULE VOLTAGE (AC) to compare engine RPM and voltage readings. If voltage readings are not within specifications, repair open circuit between ignition coil and instrument cluster. If voltage readings are within specifications, go to step 3).
Inspect instrument cluster printed circuit for cracks or poor contacts. If no problem is found, replace tachometer. If cracks or poor contact points are found, replace printed circuit.

IGNITION CONTROL MODULE VOLTAGE (AC)