2009 Buick Lucerne Owner's Manual - Page 176

Speedometer and Odometer The speedometer shows the vehicle speed in both miles per hour (mph) and kilometers per hour (km/h). The odometer shows how far the vehicle has been driven, in either miles or kilometers. This vehicle has a tamper resistant odometer. If the vehicle needs a new odometer installed, the new one can be set to the mileage total of the old odometer. If this is not possible, it is set to zero and a label must be put on the driver's door to show the old mileage reading when the new odometer was installed. Trip Odometer A trip odometer show how far the vehicle has been driven since the odometer was last set to zero. See Driver Information Center (DIC) on page 3-51 for information on resetting the trip odometer. Tachometer The tachometer displays the engine speed in revolutions per minute (rpm). 3-36