How to correct the speedometer accuracy after larger diameter tires were installed??

[bborder]

Anyone know how? My speedo appears to be about 10mph off.

 

[03 DSG Snake]

10? WOW. You can use a Speedo Calibrator like the ones offered from Dallas Mustang or Brothers. I think its called the SpeedCal. I THINK it might be able to be done through a computer chip as well..