All this talk about - Genuine Mileage - Clock Repair - Cruise Control etc reminded me of a problem I had in my car which was part of the overall rebuild of the instruments.
The odometer didn't work and the fix is quite simple and very elegant but takes a fine touch with a small toothpick and the smallest amount of Blue loctite.
Here is the website used http://articles.mbz.org/instrument/odo/
There is also a more comprehensive listing in a new article at the same sitehttp://articles.mbz.org/instrument/odo2/
The first attempt I made managed to glue the first two gears together but the second attempt has held up for 2 1/2 years.
Replacing the Speedo Cable also gave a rock steady speedo needle - especially at low speeds.