OK, here's the deal. i got my "new" cluster w/ tach and cable driven speedo, but the tach won't come on. I even was able to take out the odo and add 15000 miles to it, to match my original, non-tach cluster...
HOWEVER, when I couldn't figure out why everything was working, EXCEPT the tach (sweep at startup, but no movement when engine running), I popped the cluster back out and looked at where the actual tach plugs into the cluster, there are 3 pins. One says "sig", so I trace it on the board to the plug socket, and find the corresponding pin on the plug, only to be staring at a blank spot (I guess my car just wasn't meant to have a tach).
So all I need to know is does my car still have a tach signal wire (even though it is not in the factory gauge plug). If so, anyone know the color/location?