I have a obd1 reader installed and when I check the temperature is reading on that so it's not the sensor and not a fault before the ecu.
It must be a fault somewhere between the ecu and gauge.
My question is.
Has anyone else had this and what was it?
Could it be the actual gauge that's faulty.
The needle will drop and then raise again..
Some days it's fine. Other days the needle stays down.