Oil Temp Gauge Not Working

[N9453V]

I noticed my oil temp gauge not indicating in my M20G, but all other gauges including oil pressure and CHT were normal. I have an EDM-700 so I know engine operation was normal.

The plane just went through an oil change, vacuum pump replacement and static system/transponder check (I know the headliner near the gauges was removed for that), so I'm wondering if some work done could have disconnected the gauge or the sender. Or perhaps the gauge failed and it was just a coincidence.

Thoughts on this? Also, does anyone know where the oil temp sender is installed on a 1970 M20G?

Thanks,

-Andrew

[Hank]

Check the safety wire on the oil filter. I change the oil myself, but being new to safety pliers and having little room to work, I often have an A&P put the wire on for me. One time it ended up cocked and was touching the oil temp probe above the insulator. Master "ON," Oil Temp pegged! Cut the safety wire and it worked right, so the wire was removed and redone correctly.

[N9453V]

It ended up being the ring terminal connecting the gauge wire to the probe. The wire had disconnected from the terminal, so a simple repair to replace the terminal fixed it.