Excellent info Peter.
I never advance my thinking to the "cheating" stage, so that's why I couldn't figure out the design.
Now it makes perfect sense for the GM engineers to design it that way, and the reason for the two wheels with 10,000 and 1,000 are not anchored except for the plastic piece.
The electronic digital odos of today are probably designed to totally FAIL if ever tampered with. LOL
Thanks Again,
Ogre