tach

English Thesaurus

1. measuring instrument for indicating speed of rotation (noun.artifact)

hypernym	:	measuring device, measuring instrument, measuring system,
definition	:	instrument that shows the extent or amount or quantity or degree of something (noun.artifact)

hyponym	:	tachograph,
definition	:	a tachometer that produces a graphical record of its readings; used to record the speed and duration of trips in a motor vehicle (noun.artifact)