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IIRC, most temp guages of the day relied on the resistance (to stretch) of little tiny springs. After 35 years, those springs weaken and the readings are no longer accurate (as if they ever were in the first place). There are people who advertise in Hemmings under "Services" that will repair/recalibrate them.
Glenn Morgan: 66 GT V-Burgundy Fastback 351w+toploader+9 in. TracLoc. Started out as a rusted-out Chicago-area crusher. After sacrificing a solid 66 coupe for its sheetmetal sub-assemblies, I have one solid (and expensive) work in progress!
Glenn Morgan: 66 GT V-Burgundy Fastback 351w+toploader+9 in. TracLoc. Started out as a rusted-out Chicago-area crusher. After sacrificing a solid 66 coupe for its sheetmetal sub-assemblies, I have one solid (and expensive) work in progress!