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Re: '70 C10 Temp Gauge Max Hot, Why?
The circuit works so when the wire is off of the sensor the guage should read low. When the wire to sensor is grounded to the block the guage should peg high and it should be some where in between when hooked to the sensor. The key must be on for these tests.
If you get no action then I would check the continuity of the wire from the sensor to the guage plug at the circuit board disconnect the sensor from the wire for this. If you have good continuity then I would pull the guage. It is possible to just remove the temperature guage pair from the rest of the guages. Possible not easy.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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