First we need to define terms, you are all over the map:
I think you mean odometer, it is the counter that records the total distance driven.
A speedometer is something that registers the rate of travel over time.
Calibration of the odometer is probably not want you want, that would just insure that it will record future distance travelled accurately. I think, you just want the odometer to be ajusted to accurately reflect true distance driven with the car.
And when you say "new one", do you mean an entire instrument cluster?
I would suspect that no legitimate shop would modify the odometer, it is a Federal felony in most cases. Just not worth it, because they don't know your intentions...despite the fact that you want to roll-forward value of the odometer.
So you will probably have to do it yourself. Two ways that I can think of doing it.
1. Adapt a drill to turn your speed sensor and just let it run until you get to your appropriate odometer reading. Probably take a couple of weekends and a battery tender to do it...100MPH x 140 hours?
2. Remove the cluster and disassemble. very carefully remove the odometer and reassemble it with the proper reading on it. This will probably be fairly difficult as I would think it is not made to be removed (ever) and will require small precise tools.
And legal disclaimer: it is a felony not to disclose the fact that the odometer has been tampered with or modified.
Good Luck
Drew
