1995 GMC Sonoma Owner's Manual - Page 101

Trip Odometer Standard Cluster Tachometer Cluster The trip odometer can tell you how far your vehicle has been driven since you last set the trip odometer to zero. Make sure the button is conlpletely depressed. To set the tt-ip odometer t o zero, completely push the button near the readout. Tachometer The tachometer displaysthe engine speed in revolutions per minute (rpm). Each tachometer has a different limit depending on the powertrain in your vehicle. The tachometer has three areas: normal operating range, red warning range, and red danger range. 2-55