GM Service Manual Online
For 1990-2009 cars only

Object Number: 822624  Size: B3

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

If your engine speed equals or exceeds the safe limit for operation, the message HOT...REDUCE ENG RPM is displayed on the DIC.

Notice: If you operate the engine with the tachometer in the shaded warning area, or when the message HOT...REDUCE ENG RPM is displayed, 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 or when the message HOT...REDUCE ENG RPM is displayed.