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Kurt.......I think you mean speedo???????
Sounds like the classic issue with the wheels slipping on the odometer shaft. You could probably fix it yourself if you want to take a shot. The link in my signature line takes you to some resources and other links. In the speedometer section is a pictorial for getting at those odometer wheels and gluing them back into place. It was for an '78 R100/7 but the only real difference is that you have a cable to drive the tach instead of the '78s electronic tach.
If you have experienced help, the glue method should work just fine. I (apparently) should not be allowed to use glue and could not achieve a lasting repair job. Perhaps the JB-Weld that I chose did not adhere well to the plastic gear? Or I did a poor prep job.
I gave up and sent my unit to Palo Alto Speedometer. A bit pricy, but way cheaper than a new speedo/odo unit. They cleaned and lubed everything and installed a pair of jam nuts - one on either side of the slipping drive gear. That seems to make a good mechanical lock between the gear and shaft. They also re-calibrated the speedometer. I checked against GPS - spot on.
I have used Overseas Speedometer in Austin TX with good results.