tachometer
A tachometer (revolution-counter, tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are increasingly common.
The word comes from Ancient Greek τάχος (táchos) 'speed' and μέτρον (métron) 'measure'. Essentially the words tachometer and speedometer have identical meaning: a device that measures speed. It is by arbitrary convention that in the automotive world one is used for engine revolutions and the other for vehicle speed. In formal engineering nomenclature, more precise terms are used to distinguish the two.
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The word comes from Ancient Greek τάχος (táchos) 'speed' and μέτρον (métron) 'measure'. Essentially the words tachometer and speedometer have identical meaning: a device that measures speed. It is by arbitrary convention that in the automotive world one is used for engine revolutions and the other for vehicle speed. In formal engineering nomenclature, more precise terms are used to distinguish the two.
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Electrical QUESTION
Hello all! I inherited my grandpas 78 CJ5 AMC 304 V8. I am in the process of fixing it up and have run into a snag. In my efforts to get the instruments back lights and tachometer working I seem to have messed up the wiring to the ignition coil. The jeep will start but then immediately dies...