Hi,
Obviously the oil is not going to be cold after a trip!!
So you have a couple of possibilities to look for:
1) The oil temperature sensor is faulty.
2) The sender cable is faulty.
3) Always a possibility, the connection is corroded/faulty.
4) Finally - could be a faulty guage...
Easiest to check the connection by removong and cleaning, and a few on and offs to re-establish the connection.
Then trace the cable back if that doesn't work.
Check the voltage from the sensor - someone more learned than me can advise the voltage.
Des. . .
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