Oldsmobile 2000 Silhouette Owner's Manual page 190

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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, push and hold the trip/reset
button for at least 3 seconds. The trip odometer will then
display the number of miles (kilometers) driven since
the ignition was last turned on and you began driving.
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(If you use the retro active reset feature after 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 then activate the
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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 effected
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by the retro active reset so that both trip odometers
can be used separately.
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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.