Is this a 337 with the resistive senders? If so, you will note they are notoriously erroneous. I just replaced 3 ($590 each). (Makes me soooo mad too. Silly SW units that look IDENTICAL to my $25 SW unit made for MG’s)
They tend to get more inaccurate as they reach the limits of the throws on the armature. Lead and time make contact with the windings less. Not to mention the sloppy rivet that the arm pivots on.
There is a guy in Canada that rebuilds them for around $100 a piece. If someone is interested I can post his information?
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