Rewiring gauges - need help - Team Camaro Tech
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post #1 of 2 (permalink) Old Sep 28th, 07, 12:02 AM Thread Starter
Join Date: Sep 2007
Posts: 12
Rewiring gauges - need help

Hi hi

I've got a problem in the gauge cluster in my 79 z28 I need help with - none of it worked when I got the car (except the speedo). I've managed to get the voltmeter, turn signal lights, high beam indicator, and illumination working. However, the tach, temperature gauge, fuel gauge, and clock still don't work (don't give a hoot about the clock though). I noticed while messing with it that the ground for the illumination (shared with at least one gauge) is carrying some positive?? (I had the test light clip hooked to the frame for ground, and I probed the ground of the illumination and the test light lit up - did the same when I hooked the clip to the battery positive and probed it again)

I decided to just run new wires and bypass the printed circuit board since I don't want to trace all those wires to find the problem and new wires will probably be better anyway. I just need to know what all the gauge pegs are supposed to go to. I 'think' that the fuel gauge's three pegs are ground, 12v, and sending unit... just don't know which one is which. I don't know anything about the tach's pegs - there are three terminals in the center of the tach with plastic over them, and there are three in the top of the tach that I don't know which is which. I haven't even looked at the temperature gauge yet because it doesn't have a sending unit yet (previous owner put a 454 in the car, and it has a mechanical SunPro gauge zip tied to the ashtray - I want to pull the ugly thing out, but can't until I get a sending unit for the temp gauge and am sure that it works)
Jacqualine454 is offline  
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post #2 of 2 (permalink) Old Sep 28th, 07, 08:36 AM
Senior Tech
Join Date: Mar 2002
Location: Austin, TX, USA
Posts: 5,277
Re: Rewiring gauges - need help

Sorry I don't have details on your gauge hookup, but your diagnosis of the ground is right-on. Who would ever think to measure from ground to doesn't make sense, but often pinpoints the problem.

Hoepfully someone will have details on your gauges.

68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
dnult is offline  
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