For 1990-2009 cars only
Tachometer for GMC Truck TopKick C-Series (Conventional) C4/C5 2006
7.2L Caterpillar Diesel Engine and 7.8L DURAMAX Diesel Engines
Gasoline and 6.6L DURAMAX Diesel Engines
This gage shows the safe operating range for the engine speed in revolutions per minute (rpm).
