I'm rebuilding a 260Z and desperately need some expert advise on an electrical problem. Each time I start her up the oil, temp & fuel gages work fine for a few minutes then they become erratic and go to zero. All three are on the same 10A circuit as well as the turn signal, tach & choke warning light. The amp gage works fine but doesn't go thru the fuse box. I've traced the gage grounding to the alternator housing and have continuity. The alternator and regulator appear to work well, 12volts at idle and 14.5 @ 2000rpm. Neither tach nor turn signals work properly either. The tach pegs to the right at start up and may occasionally drop back to proper rpm. Turn signal flashes fast on right turn (both front & back are flashing) and nothing on left turn.

check fuse box you may have a broken or loose connector there. Seems to be that is the commonality between all those circuits. I have seen fuse boxes with broken parts where the fuse is inserted and you get intermittent connectivity.

Thanks, I'll take a closer look at the fuse box. I had it off when I replaced the kickpads and didn't notice anything unusual but didn't inspect it very closely. I also switched fuses around which didn't make a difference.

Solved the problem!!! Took the oil/temp gage out of my 240Z, switched connectors and installed it in my 260. Gage works fine. Apparently the 260 gages were bad.