I have been chasing a temp problem all summer .My gauge reads 15 degrees higher than actual temp of motor according to IR gun. I have checked the gauge and it pins when grounded,the voltage is correct at the gauge and I have run wiring direct to the gauge from the sensor. Always the same result..it reads 180 to 185 but the IR gun shows 167 and lower all over the motor.When I turn off my ignition my temp gauge still shows the normal reading and drops slowly as the motor cools. The local marina mechanic says the gauge should turn off like the rest of the gauges and I have a problem ...anyone have an opinion on this ....thanks,Bob