2002 GMC Sonoma Owner's Manual - Page 138

Speedometer and Odometer Your speedometer lets you see your speed in both miles per hour (mph) and kilometers per hour (km/h). Your odometer shows how far your vehicle has been driven, in either miles (used in the United States) or kilometers (used in Canada). The odometer mileage can be checked without the vehicle running. Simply press the trip odometer button. You may wonder what happens if your vehicle needs a new odometer installed. If the new one can be set to the mileage total of the old odometer, then it must be. But if it can't, then it's set at 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 The trip odometer can tell you how far your vehicle has been driven since you last set the trip odometer to zero. To view the trip odometer, press the button near the readout. To reset the trip odometer, hold the button until it clears. Tachometer (If Equipped) The tachometer displays the engine speed in revolutions per minute (rpm). NOTICE: On vehicles with a manual transmission, if you operate the engine with the tachometer in the shaded area, your engine or other parts could be damaged. Damage to your engine or vehicle caused by operating the engine in the shaded area isn't covered by your vehicle warranty. 2-68