So just yesterday my odometer stopped working on my 94 850. I have no idea how this happened. Wondering a couple of things.

1) How should I go about fixing this?

2) Is there something I could/should do to certify the milage. My one saving grace is that I had an oil change done 400 miles (and one and a half weeks) or so ago and I have the receipts with the date and milage clearly recorded. this should be helpful in proving that the mileage is fairly accurate (unless somebody argued that I made a dramatic cross country trip in the last week or so). but, is there something else I can do to verify for future buyers that the milage on the odometer is almost accurate?

thanks so much. I appreciate all your help.