[Gmecm] Tachometer circuit question

[Robin Handley]

>I have a 1988 Cutlas Cierra (2.8L) which the tachometer gauge has not 
>worked since I purchased the car. The schematics that I have indicates that 
>the ECM gets an RPM signal from the ignition module via white wire. Other 
>than this, I can find no other reference in my manuals to the feed circuit 
>for the tachometer gauge. I assume it would be similar to the VSS circuit 
>(the pulse train is fed to the ECM which applies a scale factor and outputs 
>the scaled signal to the tachometer).

Sorry I know nothing about the 1988 Cutlass, but I just drive my rev counter 
directly from the -ve coil wire - exactly as I did before I fitted a GMECM.

HTH

Robin