Speedometer And Odometer; Tachometer - Chevrolet 2009 Impala Owner's Manual

Speedometer and Odometer

The speedometer shows the vehicle's speed in both
miles per hour (mph) and kilometers per hour (km/h).
The odometer shows how far the vehicle has been
driven in either miles (used in the United States) or
in kilometers (used in Canada).
This vehicle has a tamper-resistant odometer. If the
odometer displays ERROR, it probably has been
tampered with and the numbers might not be accurate.
If the vehicle needs a new odometer installed, it
must be set to the mileage total of the old odometer.
If that is not possible, then it will be set at zero and
a label must be put on the driver's door to show the
old mileage reading of the vehicle when the new
odometer was installed.
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Tachometer

The tachometer displays the engine speed in revolutions
per minute (rpm).
Notice: If the engine is operated with the
tachometer in the shaded warning area, the vehicle
could be damaged, and the damages would not be
covered by the vehicle warranty. Do not operate
the engine with the tachometer in the shaded
warning area.