GMC 2003 GMT560 T-Series, Owner'S Manual

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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).
Trip Odometer
The trip odometer can tell you how far your vehicle
has been driven since you last set the trip odometer
to zero.
While the engine is running, press the reset button,
located to the right of the trip odometer, to toggle
between the trip odometer and the regular odometer.
Holding the reset button for two seconds while the
engine is running and the trip odometer is displayed, will
reset it.
To display the odometer reading with the ignition off,
press the reset button.
Engine Speed Limiting
All engines have electronic engine speed limiting. The
engine limited speeds range between
2,900 and 4,400 rpm depending on engine option
content.
Engine Road Speed Governor
This system controls maximum vehicle speed
automatically and reduces engine power until vehicle
speed gets down to maximum governed speed.
A 75 mph (120 km/h) road speed governor is standard
for most models, but can be programmed to any
speed below that default setting. Other models have a
default setting of 80 to 85 mph (128 to 136 km/h).
You may have a label on the headliner of your vehicle
with more information on your engine road speed
governor. See your dealer for assistance with
programming your engine limited speed.
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