I have a 1991 Dodge Caravan, 3.3L V6.

Recently all my gauges stopped working. I got a used instrument cluster, matching numbers and everything. Put it in, still no gauges. The fuses all have power, but I'm guessing it's going to be a bad ground wire in the wires that come into the instrument cluster. Anybody know of where i can find a wiring diagram or anything to know which one is the ground wire to the instrument cluster? Or any other possible solutions? Thanks.