I know out here on the East coast people have tried to figure out how but as far as I know it can't be done. Damn electronics anyway!
there are ways to get around it (change the milage), but you cant turn them back that i know of any way
The odometer is only a display the mileage info is usually on the ECM , or BCM or both and is safeguarded by the operating software.
Personally, I don't like the new Speedos. The spandex chafes, they creep up your crack, and it's hard to get a rolled up sock in them. Oh. Speedometers. Nevermind.
yes it can be done but takes alot of hardware and propper software to do it along with some times a new body prom chip. so i have heard.