[VetteVet]

You will need to pull the fuse panel away from the firewall by removing the two diagonal screws that hold it in place. Look on the back of the panel for a dark green wire that runs to the pnl lts fuse. The gray wire should be on the other side of the fuse that the dk green wire is attached to. The dk green wire comes from the headlight switch rheostat (dimmer switch) to the fuse panel and is the feed wire for the dash lights. The gray wire should be attached there and it runs to the terminals I mentioned in my post above.

The gray wire runs from the PNL LTS fuse on the fuse panel to the cluster plug to terminal 8 on gauge panels and to terminal 12 on idiot light panels. It joins with the heater lights panel wire on those two terminals.