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Discussion Starter #1 (Edited)
Will the stock water temp sensor for factory guages work on a aftermarket temp gauage? I plan on installing the console gauge pod someday but in the shorterm I plan on useing a inexpensive 3 gauge unit. The car is a 69 with a 350 crate motor.

Clint
 

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As John said, the gauge and it's sensor go together. Sensors have a wide range of resistance differences. Some sensors make more resistance with increasing temperature (Positive Temperature Coefficient) while others decrease their resistance with temperature (Negative Temperature Coefficient).
 

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shorterm I plan on useing a inexpensive 3 gauge unit.
you can try it in a jug of water and temp gauge.
It may read 'wrong' but if u know where 180, 212 deg is on the gauge then are ok.
 

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As said, GM uses the negative temp coefficent meaning cold, high resistance, 5K to 10 kohms, read from the terminal to sender body; sender at operating temperature, low resistance, approximately 150-180 ohms to indicate 180° on GM gauge, maybe, but close.
 
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