Dash gauge problems

Yeah at first, last evening, I was typing "color me clueless" because the amo gauge is totally seperate from the rest of the instrument panel. Then I thought it might be that a amp gauge wire chafed until shorted to one of the other gauge posts. OK sparks from a short isn't exactly fire. Then I thought well... a water leak could cause a similar short too.
This morning I'm thinking a short circuit could be anywhere foom the alternator harness ( the temp sender wire is taped in with ) all the way back to the bulkhead connector.
Questions... Do you have a solid state inst' voltage regulator or the original limiter inside the fuel gauge ?
Does the stock oil pres' gauge still work ?

It has the orig. limiter inside. I have the stock oil pressure gauge unhooked
at the engine as I use a mechanical gauge. The oil gauge was pegged with the new engine.
At cold my engine is 72 pounds or so. I'll check the orig oil sending unit wire......it may have grounded.