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Message: [QUOTE="JD3020, post: 272548, member: 373"] Engine off or at an idle, if the gauge is reading 14, 14.7, 15, or whatever then that means it is showing you the absolute pressure that the sensor is reading. So its atmospheric pressure, plus whatever pressure is being built. So say if it reads 14 engine off, then when its running and shows 60 pounds of back pressure then it is really 60-14, which is 46. But if at idle or engine off, and it is showing 0psi, then it is already accounting for and subtracting the atmospheric pressure. So if its showing 60psi, that would 60psi of back pressure. On my OBS the scangauge shows boost and MAP. Boost at idle or engine off is 0, while MAP(manifold absolute pressure) is reading about 14.7. So the boost reading is automatically subtracting 14.7 and showing me what my boost reading is. When i'm building 20psi of boost, the MAP reading is 34.7 [/QUOTE]

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