Oldsmobile 2001 Silhouette Owner's Manual page 180

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Retro Active Reset
Each of the two trip odometers has a feature called
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retro active reset. This feature can be used to set either
(or both) trip odometer(s) to the number of miles
(kilometers) driven since the ignition was last turned on.
This can be used if you forget to reset your trip
odometer at the beginning of a trip. To use the
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retro active reset feature, press and hold the trip/reset
button for at least three seconds. The trip odometer will
then display the number of miles (kilometers) driven
since the ignition was last turned on and you began
driving. (If you use the retro
you have started the vehicle, but before you begin
moving, the display will show the number of miles
(kilometers) you drove during the last ignition cycle.)
Once you begin driving, the trip odometer will
accumulate mileage. For example, if you have driven
5.0 miles (8.0 km) since you started your vehicle, and
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then activate the retro active reset feature, the display
will show 5.0 miles (8.0 km). As you drive, the display
will then increase to 5.1 (8.2 km), 5.2 (8.4 km), etc.
Only the trip odometer that is displayed will be affected
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by the retro active reset so that both trip odometers can
be used separately.
2-98
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active reset feature after
Tachometer
The tachometer displays the engine speed in revolutions
per minute (rpm).
NOTICE:
Do not operate the engine with the tachometer in
the red area, or engine damage may occur.