my real concern over and above that I think a speedometer should be fairly precise and 10% in my opinion is ridiculous from a precision standpoint is the odometer. 7% on a 60,000 km lease is 4200km, that is significant, luckily I am no where near my limit, but more the principle.
Andrew
I know that is GM's stand on speedometer calibration too.. We even see the certified versions such as ordered in a SEO package for law enforcement vehicles read 10-12 mph different than the standard stock clusters. They won't even let us do anything to the IPC's but remove and send back! Guess they are afraid we'll change the mileage somehow! We have just gotten to where we can program miles and hours on replacement IPC's now..providing they are set a 0 when they are shipped..