GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 TopKick C-Series (Conventional) C6/C7/C8 🢒 Instrument Panel 🢒 Warning Lights, Gages, and Indicators 🢒 Tachometer

7.2L Caterpillar Diesel Engine and Isuzu 6H Diesel Engines
Object Number: 830011 Size: A2

Gasoline and 6.6L DURAMAX® Diesel Engines
Object Number: 830010 Size: A2

This gage shows the safe operating range for the engine speed in revolutions per minute (rpm).