Gauge question

[dave`12]

I'm going to try to figure this out on my day off (Tues); thought perhaps I could get some input before beginning to check stuff out because I'm really bad at electrical stuff. I do have a tester, and can follow instructions.


1967 c10, factory gauges. Mechanical oil, no tach.
I recently replaced the fuel sender.
My Alternator is new, as is the regulator. Good Optima battery.
Everything working fine until..

I left the truck at the tire shop getting new wheels overnight. It would not start in the morning. Started with a jump. Drove home, shut it off, thinking that they had left the interior light on all night (it sticks). So I thought it would be charged up. But no, it won't start, showed 10.5 volts.

Now, I see that my volt/amp (amp, I think) gauge no longer moves, showing discharge, or charge. (just sits in the middle). My fuel gauge shows 1/4 tank, but I know the tank is nearly full. I did check the fuses on the fenders that go to the volt gauge, they are both good.

This seems like quite a coincidence, so, do you think it's all related?

Going to charge the battery today, and start testing tomorrow. Any tips appreciated.