Hi,

New oil temp gauge and sender, installed correctly. .all new parts including wiring. (Sender is the drain plug type)

Reads correctly. Suddenly, maxes out. Shut off car and restart-reads normally.

What is the issue?

Thanks

Bad gauge IMO. The sender wouldn't change from a re start, but the gauge would.

Now it is doing it all the time. . same diagnosis? I think I have an old gauge around, even if it isn't the same calibration, it might indicate gauge or sender?

Do you have a PN for that drain plug sender? I've been looking for one for a long time.

No, I don't. . it was an Evil Bay buy. . maybe a mistake.

I've been running one for a couple years. Bug application. You have a short in the wire from the sender to the gauge if it does it all the time. Remove sender wire from gauge, make a jumper lead, and switch back and forth from ground to open. That will eliminate the gauge.