Funny we are going through the same drama at close to the same time with your electrical. Getting the gauges to work and finding a bad fuel gauge. I have Ralley gauges but still the same issues with the Gen and fuel gauge. I have all kinds of pics.
What I ended up doing on mine was pulling out the guage cluster and testing everything with a 9 volt battery, allagator clips and 500 ohm POT. I verified my gages worked, and that I had good grounds. I replaced all the bulbs, the sockets, printed circuit board, bead blasted and painted the inside of the metal housing white and the outside with weld through primer.
Guess what, don't spray the outside with weld through primer it doesn't conduct electricity. In fact it makes a pretty darn good insulator. I ended up scrapping a bunch off in certain places to get my grounds and Hi beam light to work.
I put dielectric grease on the big connector that mates to the printed circuit board and on each of the bulb sockets. Makes it much easier for the bulbs and connector to go on and off without damageing the printed circuit traces.
I traced my fuel gauge problem to the tank. The very thin coil resistor on fuel sending unit had corroded apart. I was able to kinda make it work until I got another one. The big issue now is the gauge would not got all the way to "E" when empty and goes way past "F" when full.
Get back to work on that dimp Gen idiot light issue. I want to see how that turns out:)
