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Discussion Starter #3
For the guage - assuming sending unit is the problem. guage takes a long time to move and then drops back down to zero after a while.
 

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Sending unit rarely fails. Rarely. Is the thermostat working?
The ECT sender is under the distributor and is a single wire
 

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Discussion Starter #5
Assume thermostat is OK since heater is working properly. A mechanic friend of mine told me it was probably the sending unit.
 

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My shop manual says 137 ohms at 133F and 46-30 ohms at 200F.

So it is like a good woman, the resistance drops as it heats up. :D
 
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