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Seems to be indicating too low no matter what, as compared to the old gauge. It is fully mechanical, installed in dash in pretty much the stock location. I can't find any kinks or places where it's touching other metal.
Seems to indicate too low...I've got good heat in the truck before the gauge hits 130, and it's leveling off at about 175-180 on the gauge, when the truck has a 198 degree thermo.