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2. Hobbs meter - Wikipedia

   en.wikipedia.org/wiki/Hobbs_meter

   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. This maximizes the recorded time. It can be activated by oil pressure running into a pressure switch, and therefore runs while the engine is running.

3. Boost gauge - Wikipedia

   en.wikipedia.org/wiki/Boost_gauge

   Boost gauge on a Ford Focus RS (left) 30 psi Boost gauge Top: Turbo/APC boost gauge in a Saab 900 A boost gauge [1] is a pressure gauge that indicates manifold air pressure or turbocharger or supercharger boost pressure [2] in an internal combustion engine.

4. 2025 Ram 1500 - Everything You Need To Know - AOL

   www.aol.com/2025-ram-1500-everything-know...

   Gauges-inc: Speedometer, Odometer, Voltmeter, Oil Pressure, Engine Coolant Temp, Tachometer, Oil Temperature, Transmission Fluid Temp, Engine Hour Meter and Trip Odometer Power Rear Windows

5. 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

6. 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 ...

7. Inch of mercury - Wikipedia

   en.wikipedia.org/wiki/Inch_of_mercury

   However, the inch of mercury is still used today in car performance modification to measure the amount of vacuum or pressure within the engine's intake manifold. This can be seen on "boost gauges (forced induction) or vacuum gauges (natural induction), which give a rough indication of the relative power being produced at any given time.