Pontiac 1999 Firebird - Manual (Page 133)

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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 kilometers
(used in Canada).
You may wonder what happens if your vehicle needs a
new odometer installed. If possible, the new one has to be
set to the same reading the old one had. If it can’t be, then
it’s set at zero, and a label on the driver’s door must show
the old reading and when the new one was installed.
Trip Odometer
The trip odometer can tell you how far your vehicle has
been driven since you last set the trip odometer to zero.
To set the trip odometer to zero, press the TRIP
OIL/RESET knob on the instrument panel cluster.
Tachometer
The tachometer displays the engine speed in thousands
of revolutions per minute (rpm).
NOTICE:
Do not operate the engine with the tachometer in
the red area, or engine damage may occur.