If it's a mechanical hookup, it's a bad gear, but I don't believe yours is mechanical.
Call Palo-Alto speedometer (google them). They can fix yours. That or buy a used one and swap it out.
You can also get a used one, have it's milage set to match yours by them (plus a few to account for usag) and then swap it quickly when the time (milage) comes.
Thx -CTH
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