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Bob, I have both parts and service manuals, and there is nothing indicated as to an adjustment of any kind. It says you must buy a matching pair if replacement is called for. I also looked around carefully and couldn't find anything with a visual inspection (although I didn't take the gages totally out of the panel as that's the exact thing I'm trying to avoid due to the amount of hassle it is).
I can tell the gage is OK since when I switch the wires on the gages the front engine still reads its normal reading on the rear gage.
I think next I might try switching the probes and see how that affects the readings.
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