Well, Old Blue, you and I are seem to be going down the same path. Previously I had posted the same problem. Didn't get a great response about the solution. Called Chevy Duty and they said that I had a bad ground at the sensor due to using thread sealant. Took all the sealant off and no change. I inserted a resistor inline with the sending unit back to the gauge (30 ohm) and it solved the problem of going all the way to the right, but it doesn't tel me if the engine overheats that it will read the increased temperature correctly. Measured the temperature of the water at the thermostat with an exterior mounted hose sensor and the temps seem to be correct, but again, who knows when the engine temp gets too hot? The sensor operates with a temperature resistor (thermistor) but I don't know what the ohm rating is. Am still awaiting an informed response to this problem.
