Chevrolet 1999 Express Van Owner's Manual page 119

Speedometer
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).
You may wonder what happens if your vehicle needs a
new odometer installed. Laws vary as to the procedure
that must be followed, so check with your state or
provincial vehicle registration office. But generally, if
the new odometer 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
To reset the trip odometer, fully press the reset button
located near the trip odometer readout.
The trip odometer can show either total miles or trip
miles by using the push control in the cluster.
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The trip odometer can tell
you how far your vehicle
has been driven since you
last set the trip odometer
to zero.
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