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

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

    Manual Tilt/Telescoping Steering Column Gauges -inc: Speedometer, Odometer, Voltmeter, Oil Pressure, Engine Coolant Temp, Tachometer, Oil Temperature, Transmission Fluid Temp, Engine Hour Meter ...

  4. 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. They are commonly mounted on the dashboard, on the driver's side pillar, or in a radio ...

  5. MAP sensor - Wikipedia

    en.wikipedia.org/wiki/MAP_sensor

    Engine vacuum is the difference between the pressures in the intake manifold and ambient atmospheric pressure. Engine vacuum is a "gauge" pressure, since gauges by nature measure a pressure difference, not an absolute pressure. The engine fundamentally responds to air mass, not vacuum, and absolute pressure is necessary to calculate mass.

  6. Tachometer - Wikipedia

    en.wikipedia.org/wiki/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. [1] The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are increasingly common.

  7. Tell-tale (automotive) - Wikipedia

    en.wikipedia.org/wiki/Tell-tale_(automotive)

    The oil pressure idiot light lights when engine oil pressure drops below a predetermined level. The light normally appears when the vehicle ignition is turned on, but the engine is not running, as it detects no oil pressure due to the oil pump not operating (the oil pump is powered off the crankshaft, so only operates when the engine is running ...

  8. Pressure measurement - Wikipedia

    en.wikipedia.org/wiki/Pressure_measurement

    Example of the widely used Bourdon pressure gauge Checking tire pressure with a spring and piston tire-pressure gauge. Pressure measurement is the measurement of an applied force by a fluid (liquid or gas) on a surface. Pressure is typically measured in units of force per unit of surface area.

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