The gauge was installed in car when purchased a few years back, I'm guessing it's at least 15 years old, but who knows for sure? I'm embarrassed to admit that I don't know the difference between an electrical and mechanical gauge. I'm sure there is a real simple way to tell the difference. I think it's mechanical, there is a metal tube which runs from the block to the gauge, similar material to the capillary tube on my heater control valve. I'll check all wiring and connections tomorrow.

I sure hope it's not a major problem, Bondo has treated me well for a long time now and I'd hate to have him quit on me now.