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From Longman Dictionary of Contemporary English
Related topics: Motor vehicles
tachometerta‧chom‧e‧ter /tæˈkɒmɪtə $ -ˈkɑːmɪtər/ noun [countable] technical  TTCa piece of equipment used to measure the speed at which the engine of a vehicle turns
Examples from the Corpus
tachometerI am unable to find a supplier of an add on tachometer.
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