Oldsmobile 2002 Alero - Manual (Page 121)

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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).
Your vehicle has a tamper resistant odometer.
The digital odometer will read 999,999 if someone
tries to turn it back.
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.
The reset button is located below the tachometer.
To reset the trip odometer to zero, press and hold
briefly the ribbed side of the button while the trip
odometer is displayed. Also, by pressing this button
for less than one second you can toggle between the
odometer and the trip odometer.
Tachometer
The tachometer shows your engine speed in revolutions
per minute (rpm).
NOTICE:
Do not run your engine at speeds in the red area,
or engine damage may occur.