Hello all, I have a 2000 GTP I just picked up. The previous owner replaced the stock wheels with 17" ones and, obviously, the speedo is off. Seems to be a fairly consistent 5mph off, if I base it on my GPS's speed. Now, I am more than comfortable with simply subtracting 5mph from my speed when driving, but it is actually my wife's car and she will probably forget, a lot. Is there any effective way to recalibrate the speedo to make it more accurate?
Thanks, I appreciate the help.