I would like to test the ground but that would require I remove the dash cluster, I think. This is beyond my experience level.

Could the sender be the culprit? I read in the archives that a faulty sender can cause the needle to jump a bit. BUT, will it also cause the gauge to read high.

I did have the tech take IR temp at the top radiator hose. Reading was 72 and the temp gauge was at 95. The prompted my tech to tell me that there were no issues and just drive the car.

Still, I have to have a good temp indicator...I am obsessed with watching this.

Is the sender easy to install..I know where it is as the tech pulled it off and sure enough the gauge dropped to zero.

AC

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'83 240D (W123) 321K miles
250KM Mileage Award
500KM Mileage Award

'84 300TD (W123) 215k miles
250K mileage award pending