As HRL stated, first thing to do is measure with a KNOWN GOOD gauge, then take appropriate action. If you have several gauges, try them all and compare the results, get rid of the one/ones that are reading far from the average.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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