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#1
10-24-2023, 11:12 AM
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Temperature gauge driving me nuts
'67 GTO with Rally gauges. Temp gauge stays at minimum all the time. There is continuity between the thermostat and gauge connections, 12V feed to gauge is good with engine running or key on. Gauge resistance reads 40k, and pegs to min or max depending on lead polarity. Feed from tstat to ground reads 600 ohms cool, 160 ohms at 150 F. Same readings at the gauge connection. The gauge housing has its own ground wire. Reversing the hot and signal leads on the gauge changes nothing. The same voltage feed goes to the oil pressure gauge and that reads fine. Disconnecting it has no effect on the temp gauge behavior.
The gauge spikes during crank. I've tried 3 different thermostats. I'm about ready to break out the 'fine adjustment tool.'
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461 Stroker Built by Me - 
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