Alright my Voltmeter has never worked and while my gas gauge did work, it was prone to wild mood swings, which weren't affected by a new sending unit. While going through a parts hoard in sioux falls I bought a 280z voltmeter for five bucks. I tested it that day and it worked perfect. So I just got around to wiring it up tonight. After some research found out went out hooked up the the wiring with just test leads the way I read worked, and the volt meter worked, as did the gas gauge and the gauge light. So wired it all up that way, and tested it again still works perfect. Unhooked the gauge so I could tape up any thing that needed check everything over once more hooked it up and the volt meter didn't work this time, dash light and gas still did though. So I checked the W/R and W wires that usex to lean into the ammeter plug, and that minutes before tested at 12 volts and nothing. Confused and disgruntled I checked all the fuses and fusible links.and all checked good. I went in to research and the only explanation my research led me to was the ammeter shunt which I simply can't find a picture of and I have no clue where it is. So if someone could help me with or offer any other idea/reason why those wires suddenly lost power that would great. Wanna get this wrapped up tomorrow.

Ha! It was bugging so bad I said screw it, went popped the hood and started looking for this "shunt box" and found a gold box under the carbon canister that said

Kantoseiki FUSE on it. Pull off and open to find two blown 3 amp fuses replaced them and boom my new voltmeter works awesome! I suppose I'll just tinker more before posting a thread next time. But as my search turned up very little, I will add some pics once the suns up, and include some more info so that this may help a future or kind of turn it into a mini write up.