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An OHM meter will tell the tale!

Getting back to working on the Super. I haven't had time to do anything with it for several months.

Right now I'm trying to figure out the fuel gauge problem. Gauge never reads anything. There are two posts on the rear of the fuel gauge, and tried grounding the one in the center of the fuel gauge....turns out that just makes sparks at the ground. The upper post is the one that brings the signal from the fuel tank. So I grounded that one out tonight for less than a second. The gauge flew immediately to Full, and went immediately back down to Empty when I quickly released ground. Now it doesn't move at all when grounded anymore.

Did I blow the gauge? The car has been converted to 12V. No idea what sort of protection is present for dash gauges and lights. None of the lights work on the dash and none of the gauges work except for speedo (mechanical), oil pressure (mechanical), and temperature. Everything else (ammeter, fuel gauge, clock, etc) is dead. It's been this way ever since we got the car running again. No idea if they ever worked in the past.

I will still drain and drop the tank (ugh) to check the fuel sender. But I wonder if there is something else going on here. The wiring behind the dash is a nightmare....so many additions that I have no idea what anything does or where it goes. Is there a wiring diagram out there for 38's?

-Kevin