GMC 2002 Envoy - Manual (Page 144)

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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. The new one will be set to the
correct millage total of the old odometer.
Trip Odometer
The trip odometer can tell you how far your vehicle has
been driven since you last set the trip odometer to zero.
The trip odometer is part of the Driver Information
Center (DIC). For information on how to reset the trip
odometer see “Driver Information Center (DIC)” in
the Index.
Tachometer
The tachometer displays the engine speed in revolutions
per minute (rpm).
NOTICE:
Do not operate the engine with the tachometer
in the shaded warning area, or engine damage
will occur.
Warning Lights, Gages and Indicators
This part describes the warning lights and gages that
may be on your vehicle. The pictures will help you
locate them.
Warning lights and gages can signal that something is
wrong before it becomes serious enough to cause an
expensive repair or replacement. Paying attention to
your warning lights and gages could also save you or
others from injury.