Pontiac 1997 Grand Am Owner's Manual page 112

Speedometer and Odometer
Your speedometer lets you see your speed in both miles
per hour (mph) and kilometers per hour
(lun/h).
Your
odometer shows how far your vehicle has been driven,
in either miles (used in the United States) or kilometers
(used in Canada).
Your Pontiac also has a tamper-resistant odometer. If
you see silver lines between the numbers, you'll know
that someone has probably tried to turn
it
back,
so
the
numbers may not be true.
You may wonder what happens if 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.
Trip Odometer
The trip odometer can tell you how far you have driven
since you last reset it. To reset the trip odometer to zero,
press the knob at the top left side of the instrument
panel cluster.
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