Speedometer And Odometer; Tachometer - Chevrolet Impala 2007 Owner's Manual

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 in kilometers (used in Canada).
Your vehicle has a tamper-resistant odometer.
If you see ERROR, you'll know someone
has probably tampered with it and the numbers
may not be accurate.
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 that will be done. But if it can't,
then it will be 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.
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Tachometer

The tachometer 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.