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Well finally had a chance to talk with Siemens and they sent me a few trouble shooting guides. A part of one says :
"If your gauge's pointer moves noticeably when the lights, fans, or air conditioner turns on, you are experiencing a low voltage condition. This may be due to the following factors:
You have installed the gauges to an overloaded circuit either on the positive or negative wire. Re-wire to eliminate problem.
Voltage output of alternator during idle conditions may be too small for electrical system. Hook up voltmeter and monitor voltage. Voltage should not drop below 12.75 volts at any time. "
I have gone to some higher output lights come to think of it so I will check to see if the VDO gauges happen to be on the same circuit. I do not see the problem when the fan is on and don't see any voltage drop at battery/fan etc. Doesn't just do it at idle either. They also talk about minimum wires sizes and I will check that also. I suspect whatever circuit feeds lights/light switch powers dash gauges also.
Maybe this will help someone else also.
Bruce
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