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Temperature Gauge / Sender - Reading High

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3.5 v8 110 1988

Recently my temperature gauge has started reading excessively high (no relevant recent work to the dash or sender that I can think of). I've checked the actual temperature of the engine with a laser thermometer and all seems well. 

Am I right in thinking that the gauge is supplied with 12v and then the temperature sender is effectively a variable resistor in the circuit? In order to fault find, am I best looking for leakage to earth, or poor earth connections at the gauge / engine? I've tried a spare sender I had and the change in sender does not seem to solve the issue. Welcome any guidance on how to approach looking at the issue / how the circuit works!



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If I remember correctly the gauge is supplied with 12v, the striped wire then leaves the gauge to the corresponding sender and is earthed via the sender to the engine block. Worth getting a new sender of the corect type for your gauge fitted. 

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