Correct answer
To find out how many revolutions per minute the vehicle's engine is turning, and thus make better use of the engine's performance.
It indicates engine rotational speed in revolutions per minute (rpm). It helps you monitor engine speed and operate within the manufacturer’s limits and recommendations. It does not directly indicate road speed, fuel quantity or oil level; those are functions of other instruments.
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To find out how much fuel is left in the tank.
To find out the level of the engine's lubricating oil.
To find out how many revolutions per minute the vehicle's engine is turning, and thus make better use of the engine's performance.
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