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...as I understand it, Manifold Air Pressure (MAP) and Mass Air Flow (MAF) basically tell you how "deeply" the engine is breathing in air, MAP by differential pressure (intake vs. outside air) and MAF by "how much" air is being sucked (breathed) in.
...hence, in my mind, they're fancy vacuum gauges, with MAP being most like a vacuum gauge. MAF is "mass" based rather than "pressure" based.
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