See also:

Head restraints
Head restraints supplement the other vehicle safety systems. They may provide additional protection against injury in certain rear end collisions. Adjust the head restraints properly, as spe ...

Tachometer
The tachometer indicates engine speed in revolutions per minute (rpm). Do not rev engine into the red zone 1 . CAUTION When engine speed approaches the red zone, shift to a higher gear or reduc ...

NISSAN dealer.
However, now and then you may notice light spark knock for a short time while accelerating or driving up hills. This is not a cause for concern, because you get the greatest fuel benefit when ther ...