Oldsmobile 1999 Intrigue - Manual (Page 112)

yellow blue
2-52
Trip Odometer
Your trip odometer (trip mode) tells you how far you
have driven since you last reset it. To set it to zero, press
and hold the TRIP RESET button on the left side of the
instrument panel for two to three seconds.
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.