My Hewitt EGT gauge with the typical "K" style thermocouple, quit giving me readings last week. But before I tear into this to try and figure out what went wrong, I thought I would ask you guys about the easiest way to troubleshoot the problem. I have physically traced the wire from the probe through the grommet in the firewall, to the gauge and found no damage. I am thinking of disconnecting the thermocouple wire from the gauge, connecting my DVM on the Millivolt scale, starting the engine and see if I get a voltage and it increases. If the voltage is there and increases, the gauge is bad...if there is no voltage present, the thermocouple is bad, correct?