The tachometer displays the engine speed in revolutions per minute (rpm).
Notice: If the engine is operated with the tachometer 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.
Chevrolet Cobalt Service & Repair Manual. Axle Shaft Oil Seal R&R
1.
Raise and suitably support the vehicle.
2.
Remove the front wheel and tire assemblies.
3.
Insert a punch or drift in the cooling
fins of the brake rotor.
4.
Using a breaker bar ...