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2. Tach timer - Wikipedia

   en.wikipedia.org/wiki/Tach_Timer

   The tach timer is usually used to schedule engine maintenance, although it is just an approximation of "Time in service" which is used to time and schedule aircraft maintenance. Time in service is defined in 14 CFR 1.1 [ 2 ] as the actual time in the air, whereas tach time measures engine revolutions, which would still count time on the ground ...

3. Tachometer - Wikipedia

   en.wikipedia.org/wiki/Tachometer

   A tachometer on a tractor, reading up to 3000 RPM, with the hour meter below it showing 772.9 hours. The mark at 2500 RPM is the engine speed required to run the power take-off at 540 RPM. Traffic engineering

4. File:Tractor hour meter and tachometer.jpg - Wikipedia

   en.wikipedia.org/wiki/File:Tractor_hour_meter...

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5. Hobbs meter - Wikipedia

   en.wikipedia.org/wiki/Hobbs_meter

   A Hobbs Meter made by General Electric about 1970. Hobbs meter is a generic trademark for devices used in aviation to measure the time that an aircraft is in use. The meters typically display hours and tenths of an hour, but there are several ways in which the meter may be activated: It can measure the time that the electrical system is on.

6. Air core gauge - Wikipedia

   en.wikipedia.org/wiki/Air_core_gauge

   An auto tachometer has a sweep of about 240-250 degrees and typically uses an air core gauge. An air core gauge is a specific type of rotary actuator in an analog display gauge that allows an indicator to rotate a full 360 degrees. It is used in gauges and displays, most commonly automotive instrument clusters.

7. Tachymeter (watch) - Wikipedia

   en.wikipedia.org/wiki/Tachymeter_(watch)

   Tachymeter scale on a Citizen watch bezel. A tachymeter (pronounced / t æ ˈ k ɪ m ə t ər /) is a scale sometimes inscribed around the rim of an analog watch with a chronograph.It can be used to conveniently compute the frequency in inverse-hours of an event of a known second-defined period, such as speed (distance over hours) based on travel time (distance over speed), or measure distance ...