I had my Cuda's rebuilt and got it back screwed up. I bought a working one off of Ebay. I took the odometer out of my now worthless spedometer and put it in the working one. When I had it out, I could adjust the numbers on the odometer to whatever I wanted, no drill needed. The state of Colorado keeps track of my odometer at emission check time and it will be where it should be when it gets checked. I beleive the vehicle history report people purchase this information. All the spedometers that have gone around through 100,000 miles around here get flagged as discrepancies anyway since they were only six digits.
Craig