<E30> temperature gauge goes crazy, but the actual temp is normal

["Mark Z." <zarich@xxxxxxxxxxx>]

Good day, all; the car is an '87 325is. Anyone seen this? The problem is 
intermittent. Usually, the temp gauge works fine. But sometimes, the 
following will happen 1.) The gauge will slowly sweep up into the red, lets 
say, within a minute or less, from the 1/2 way mark. Then it will sweep back 
down below half, when it feels like it. And, 2.)sometimes, it will jitter or 
bounce around, basically oscillate rapidly. It will bounce from full cold to 
full hot, even.

A local independent BMW garage tested the actual temperature of the engine 
with some kind of "scope" or external device, and they said all was normal, 
so it seems the gauge is going crazy, rather than the engine doing strange 
things like heating and cooling in some funny way. They did remove the gauge 
cluster and resolder the joints back there, but that didn't help, as it 
happened again. What should we go after now? Thanks in advance.

Mark Zarich
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