65 Valiant now gauges go full when ignition key turned or running

I'm about to give up on it. It's taking up too much of my time. I at least wanted to get the gauges working so I could drive it around the block every once and awhile. The car isn't worth sending to a shop to have it professionally diagnosed. I'm afraid I don't have the knowledge to test it but for what comes out of the manual and as long as I'm using the same tools in the manual. It's aggravating because the temp gauge worked fine before I sent it to be calibrated but the fuel gauge needed to be re-cored. I found two more extra gauges I have in a shipping box I have in the garage but don't know how to test them properly outside of the car.