Neither the fuel or temperature gauges seem to be working on my 1970 GT. With the lead pulled off the temp sender, and the key on, I read ~6.5 V at the lead which goes to the temp. sender, which seems consistent with what I've seen in other posts for the limited/regulated voltage. With the lead going to the fuel sender still attached, I'm reading about 5.7 V at the point where the lead attaches to the sender. With the lines going to the fuel sender and temp sender detached, on turning on the key, the gauges do not move (grounding the line to the fuel sender with the key on does not make the fuel gauge move). I looked behind the gauge, and the brown ground seems attached, and I measure continuity from the gauge bezel to ground; so I think the ground on the gauge is OK. It seems to me that if the gauges weren't getting power properly, I wouldn't see voltage at the lines going to the senders. But it also seems unlikely to me that both gauges would go out with the same symptoms; it's more likely that there's something common to both that's wrong. I'd appreciate hearing any suggestions about what might be going wrong, and/or more tests to do.