Does anyone know if the odometer and tripometer run off the speedo cable or are they run off a sensor? Neither work on the 85 XJ750NX I've got. Any help would be appreciated.

I think cable. Listed a bike bandit for $10.18.

It's a cable system. Take the cable off an see if it is broken. If not you'd have to look at the mechanisms on your wheel hub, and inside the speedometer.

Thanks Richard and KTA. I should have mentioned the speedometer works fine, the odometer and tripometer do not.

Yes, they are run from the same gable as the speedo. it sounds like you have a problem that is internal to the clock.