Nothing like that exists. If the condition of the car matches your claimed mileage and amount of mileage that you claim the odo has been broken, the buyer shouldn't have too much of a problem.

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http://i193.photobucket.com/albums/z...-RESIZED-1.jpg
1991 300E - 212K and rising fast...

The car matches up pretty well but people freak out when the odometer doesn't work. It's a peace of mind thing I suppose. I do have a carfax on it and the mileage doesn't start going funny on it till the end of the carfax. I just would have thought that most cars could be hooked up and the computer would tell them that kind of info. Crap.