I'm slowly going through a 1992 240 that has sat for about 3 years. It has 262,227 miles on it. I noted that after engine warm up, the temp gauge was still at full cold. I removed the temperature compensator board and jumped pins 1 and 3. Reassembled the cluster and still no gauge action, even when grounding the sensor wire (fuel gauge working fine). Does anyone know what the internal resistance of the temp gauge should be? I am seeing an open circuit (infinite resistance) across the terminal posts of the gauge, which probably means I need a new one, but I don't know what the resisitance should be.

I did verify that I have continuity through the board bypass. Thanks for any ideas.

Dave Milo