My initial odometer issues—involving a fluctuating needle—were caused by a broken rigid metal wire on the 2,000-ohm resistor; after repairing it, it worked for a while, then only intermittently (specifically in hot weather), before failing completely. I purchased a Harley-Davidson sensor of a different size, fabricated a custom bracket to avoid altering the original mounting location, and reinstalled it with a 2,000-ohm resistor, creating a new wiring harness that placed the resistor under the front hood; it has worked perfectly for four years.
The original resistor is located in the wiring harness, approximately 20 centimeters from the sensor.

[Linked Image]
[Linked Image]