I pulled the dash today, thinking it might be a loose screw.  No such luck, a large circuit board and everything is soldered in. 

Any ideas other than getting a replacement cluster? 

 

I did not see any problems with the circuits.

 

Everything but the Tach works.

 

Thanks, Larry

Tacometer and Speedometer are controlled by a separate module inside the cluster. Tachometer signal comes from the ECM I believe, but it has to go into the cluster CPU first. Dunno what kind of signal it is though.

Tried a used Tach from a yard.  Same thing.

I'm going to hook up my OBDII computer and see if it has a tach reading.

My OBDII computer has a tach reading, so wiring or I got another failed tach cluster.

Anyone have the FSM wiring from the ECM to gauge cluster?

 

Thanks, Larry