I need to know how to get the Factory Tach in my Sunfire to work with the '99 GTP 3800SC engine I put in it. I've tried feeding the signal from the V6 crank sensor to the PCM with no luck.

I did pull the Instrument Panel Cluster (IPC) out of the Sunfire to replace some bulbs. Inoticed a (4) Pin connector on the back of theGauge Face Plate for the Tach as well as the Speedometer.Don't know if I can hook something up here or not.

Want to keep the sleeper look inside and outside of the car. Everything in the Cluster works except for the Tach.

Any help will be appreciated. Thanks...