Sure sounds like the ground for the gauges. your probably picking up a ground through the gauge light bulb filiments to make the gauges function until 12V is supplied to them. Do the lights come on on the gauges when you pull the switch? I have a complete harness in the basement I can check to tell you where the ground wire is if it will help.
68ragtop
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68 GTO 4-spd Convertible
78 S/E Trans am L78, WS6 Auto
78 S/E Trans am W72, WS6 Auto
79 10th aniv W72 Trans am
80 Indy pace car Trans am
89 Trans am GTA
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