Yep. Very common problem with the 850's. The tiny pinion drive gear inside the odometer housing has failed and needs to be replaced. Take a look at www.odometergears.com and order one, then go over to Bay13 and look at how to pull the instrument panel out. There's a few good write ups on replacing the gear posted on the web, do a search. But the first thing you'll need is the replacement drive gear. Good luck.
If it's a '95 or older 850 with the DTC boxes under the hood you can read the actual mileage off the ECU through that if you want to.
Mike
'95 850T
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