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1987 924s Frustrating electrical problem

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Let me start by saying my 1987 924s runs and runs well.
All my gauges work well.  However, when the car comes up to temperature, things start to get weird.  When the radiator fan(s) come on, the temperature gauge
jumps up at least 25%.  If i turn on the headlights, it jumps again, blinkers make it jump more, wipers even more, etc.  If i turn them all off, the temp gauge slowly
returns to, what i believe is, the true temp PLUS 25%.  Once the fans come on, they don't turn off.
No other gauge jumps like the temp gauge.  I have even swapped out gauge cluster to no avail.


I have cleaned off all the grounds i can find.  I have yet to find the grounds behind the gauges.
At this point, i assume, there MUST be some ground I'm missing.

If ANYONE has experienced this craziness, please let me know what you did to correct this.



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