Tachometer; Retro-Active Reset - Chevrolet 2004 Venture Owner's Manual

Retro-Active Reset

Each of the two trip odometers has a feature called
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 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-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 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 miles (8.2 km), 5.2 miles
(8.4 km), etc. Only the trip odometer that is displayed will
be affected by the retro-active reset so that both trip
odometers can be used separately.
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Tachometer

Your vehicle may have a tachometer that displays the
engine speed in revolutions per minute (rpm).
Notice: If you operate the engine with the
tachometer in the shaded warning area, your vehicle
could be damaged, and the damages would not
be covered by your warranty. Do not operate
the engine with the tachometer in the shaded
warning area.