The tachometer specifies number of turns of the engine in thousand turns/minutes. Watch the tachometer indication at gear shifting to avoid an engine overload at increase of number of turns above the nominal.
Movement on big turns of the engine results in its premature wear and to the increased fuel consumption. Remember that the number of turns of the engine is lower, the profitability is higher.
Prevention
Driving when the arrow of a tachometer is in a red zone is not allowed. Otherwise the engine quickly fails.
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