GM Service Manual Online
For 1990-2009 cars only

The speedometer shows the vehicle's speed in both miles per hour (mph) and kilometers per hour (km/h).

The odometer works together with the Driver Information Center (DIC). Press the Trip/Fuel button on the instrument panel cluster to check the odometer mileage while the vehicle is not running. See "Odometer" under DIC Operation and Displays for more information.

If the vehicle ever needs a new odometer installed, the new one will be set to the correct mileage total of the old odometer.