Just getting my 86 351w/C6 on the road heading for exhaust in the morning.. Only gauge that doesn't work is my gas gauge. PO cut a hole above the tank ( ), i'd like to determine the issue before getting the sending unit out though. I think he cut the hole in the wrong spot too lol. Anyways.. Is there a test procedure to determine if it's my cluster (I doubt that), sender, wiring (some testing procedures would be great, wires look OK with a cursory glance). If it is the sending unit, where is the best place to get one for an 86, I can't seem to find them at NAPA.