GM Service Manual Online
For 1990-2009 cars only

Object Number: 1224091  Size: A2

The tachometer displays the engine speed in revolutions per minute (rpm).

Notice: If the engine is operated while the tachometer is 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.

The maximum rpm is limited in PARK (P) and NEUTRAL (N) to 4000 rpm by the vehicle's computer. This is to prevent engine damage.