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tachometer

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tachometer (tăkŏm`ətər), instrument that indicates the speed, usually in revolutions per minute, at which an engine shaft is rotating. Some tachometers, especially those used in automobiles, are similar in construction and operation to automotive speedometers speedometer, instrument that indicates speed. A cable from an automotive speedometer is attached to the rear of the transmission of an automobile; the cable turns at a rate proportional to the speed of the car.
..... Click the link for more information. . Other types, often connected directly to the shaft whose speed they indicate, are small electric generators whose output voltage is proportional to speed. This voltage is applied to a voltmeter whose dial is calibrated in speed units. Another type, used only with engines having an ignition system, operates by counting the pulsations of current or voltage in the ignition system, the number of these being proportional to the speed of the shaft.
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NSN 6680-01-502-6523 gets a new tachometer kit for the M915A2 and the M916A1 tractor trucks.
M915A2/M916A1 tachometer kit by PS, the Preventive Maintenance Monthly
The tachometer has a point labeled "Auto Stop"; when the needle is there it indicates that the vehicle is "on" even though the engine may be off.
Saturn turns green by Automotive Design & Production
I-Command can take engine information that formerly needed a dozen or so individual dash-board instruments--such as speedometer, tachometer, engine hour meter, trim indicator, engine and seawater temperature gauges, volt meter and water pressure gauge--and put them all into as little as two round, three-inch helm displays.
Evinrude goes "digital" by Croft, Scott / BOAT/U.S. Magazine
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