If you have changed out the cluster and the sensor, is there anything else? You have done all the troubleshooting that I can think of, but I still say it is a ground issue somewhere. If you find a loose ground, it should make the sensor work. The only thing I can think of is to switch out the temp gauge itself on the cluster that it is sitting pegged hot.
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latest adventure of the gauge....
burped coolant system
let car run with no coolant leak
looked inside car and needle was pegged at hot
took a ride and the needle read normal
went a couple of miles and temp gauge started wavering between cold and normal
shot up to hot and stayed there
think im gonna pull the cluster and check it but i have no idea what im looking for
Having a simular problem I don't uh understand it pegs to hot I checked the ground on the passenger floor board its good so is the rest of the grounds I replaced the temp sending sensor for the gauge same thing happen.
Only sensor I didn't replace was the ECU temp sensor