Tachometer - Toyota Lexusc Owner's Handbook Manual

GAUGES, METERS AND SERVICE REMINDER INDICATORS

TACHOMETER

The tachometer indicates engine speed in thousands of
rpm (revolutions per minute). Use it while driving to
prevent engine over-revving.
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Driving with the engine running too fast causes excessive
engine wear and poor fuel economy. Remember, in most
cases the slower the engine speed, the greater the fuel
economy.
It is not a malfunction even if the needle of the tachometer
returns to the bottom position when the ignition switch is turned
to the "START" position.