TT,
My temp gage is reasonably accurate. I had a problem with the needle pulsing to zero or just staying at zero unless I pushed on the gage bezel. The problem was a loose connection behind the gage (the 10 ohm resistor), once that connection was repaired it has read bitchen ever since.
Assuming your evaluation of your cooling system is accurate, I would suspect a wiring problem. If its reading high, that would indicate a short circuit somewhere (temperature indication increases as the resistance in the measuring circuit decreases). The resistor spliced into the circuit behind the gage may be shorting somehow. I would check the wiring behind the gage first. And the connection at the "sensor" second.
your "wired" friend on the PIBB, George
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