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I'm saying that the manual for the scan gauge, under precautions states to make sure that the gauge is unplugged b-4 disconnecting the batteries to prevent damage to the gauge.
Last page, I think it is #13.
Your call to not unplug, but damage to the gauge could have happened.
not the scanguage II.... we use aeroforce scanguages(they make termy's guages too).
you could always get a good scanner on the truck and see if the scanner gives you an oil temp reading... i have a feeling you may have messed up the SG..
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