The guys in the 87-96 forum have one of these, so I thought I would start one too. Play along if you like...
Today I swapped instrument clusters because the only gauge that worked was the ammeter. Here is the damaged ic (minus the ammeter that I took out for the other ic):
closer view of tach connections:
Later I will custom wire my tach so it works (the ic I swapped in had no traces for the tach).