The gauge will hover on high, then jump back to normal mid gauge area if I accelerate. (After full warm up) It also will spike a bit if I turn on the headlights or give the charging system a load of sorts.
On the thermostat housing. But the other poster is correct. Might also be bad SI batteries.
Instrument panel grounding - tap sharply on top of the cluster - does the temp gauge jump around as you state?
If so -you gotta remove it and look for corrosion on grounds, etc.
Is the SI battery the one that causes the tach to die and inspection light to illuminate? If so, I think that could be it.
One little tip for you David. Unless you enjoy seeing an inbox full of useless spam you might not want to broadcast your work email address on usenet.
They're easy to change on an E28, took me an hour. Get a pair of AA size NICADs with solder tags and charge them before installation (vital). They live just behind the green LEDs on the dash.
Cooling relies greatly on airflow, because the temp drops when the car is moving, I'd be looking to the fan clutch first. This is easy to replace, but it is a bit costly. You may find one on eBay ...
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