My '65 Barracuda is evidently like most old MOPAR'S and has a fuel gauge problem. My first check was to test the tank wire by grounding it. Nothing. I also removed the tank sending unit. The float was gone and the inside of the tank looked like the inside was fur lined with rust. I replaced the tank and sender. The instrument fuse has no power so I ordered a voltage limiter. My question is, what else might cause no power for the instrument fuse?'