EM broken again

The latest problem I'm having definitely seems to be a hardware issue, the voltmeter goes to 0.70V (or effectively 0V), and the fuel counter starts counting 'less'.

I also have my doubts about the tach ever working right. I was getting 3000+ RPM on climbouts and straight and level flights, which should be impossible unless I firewall the throttle and point the plane straight down.

I haven't yet figured out why the voltage going bad also makes the fuel counter go bonkers.

All I know is that it seems to be a hardware issue, like a bad soldering joint. This has happened before, it seemingly shakes itself apart.