2003 GMC Sonoma Owner's Manual - Page 154

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 happensif 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. Notice: On vehicles with a manual transmission, if you operate the engine with the tachometer in the shaded warning areas, your vehicle's engine or other parts of your vehicle could be damaged. Damage to your engine or vehicle caused by operating the engine with the tachometer in the shaded warning areas isn't covered by your vehicle warranty. Don't operate the tachometer in the shaded warning areas. Safety Belt Reminder Light When the key is turned to RUN or START, a chime will come on for several seconds to remind people to fasten their safety belts, unless the driver's safety belt is already buckled. The safety belt light will also come on and stay on for several seconds, then it will flash for several more. 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 resets. Tachometer The tachometer (if equipped) displays the engine speed in revolutions per minute (rpm). If the driver's belt is already buckled, neither the chime nor the light will come on. 3-27