speed indicator

noun
an instrument for counting the number of revolutions of a gasoline engine.
Also called speed counter.


Origin:
1855–60

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The vertical speed indicator also should indicate a rate of climb.
Verify that the speed indicator has been calibrated during the past year.
It is not clear from the report whether the speed indicator was combined with
  other speed enforcement techniques.
The control unit shall include local speed indicator.
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