I have found in the past that the bearing between the two halves of the
magnetic drive is gummed up with 50 year old oil. The increased
viscosity of the (former) oil makes it acts like a fluid drive device
and increases the meter readings. The cure is to carefully dissemble the
gauge and clean out the bearing and lube with very light oil. I use
Marvel Mystery oil when I do this work.
Randal is correct in saying that many have had similar issues due to
slightly over length drive cables but it sounded like you had this
problem prior to the change.
Edward Hamer
Petaluma CA
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