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Ambient Temp Gauge Oddities 200 1982

I have an ambient temp gague installed in my dash. Lately I have been noticing that when I turn on the lights the gauge drifts upwards about 3 degrees C. I thought it had something to do with voltage draw so I started up the car an turned on the defrost, heater fan, heated seats and the gauge stayed perfectly still. But when I turned on just the parking lights the gauge drifted again: It appears that the illuination circuit for the gauge has something to do with the problem. Has anyone seen this or know what is causing it?

Thanks,

Matt

--
'82 DL - 158k, '93 945 - 116k






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