See also:

When “CHECK DISC” is displayed
Press the eject button to unload the discs. Check that the disc is not damaged or scratched, and also check that the disc is inserted correctly. This message may appear when using some CD-RW discs. ...

Turbo models
...

Tachometer
The tachometer shows the engine speed in thousands of revolutions per minute. Do not operate the engine with the pointer of the tachometer in the red zone. This may cause severe damage to ...