The tachometre specifies number of turns of the engine in thousand turns/minutes Watch the tachometre indication at a gear change to avoid an engine overload at increase of number of turns above the nominal.
Movement on the big turns of the engine leads to its premature deterioration and to the raised expense of fuel. Remember that the more low number of turns of the engine, the above profitability.
The prevention Driving when the arrow of a tachometre is in a red zone is not supposed. Otherwise the engine quickly fails.
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