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Yeah, 2rismo, I think you'll find that the pressure reading on the gauge (gauge pressure) is different to the actual air pressure in the tyre/manifold (absoloute pressure)..... The gauge pressure = absoloute pressure - atmospheric pressure, so that as Warren stated you can understand the difference in pressure.

So if a tyre pressure gauge reads zero, the pressure in the tyre isn't zero, it's just atmospheric pressure.

i think 2rismo means that cities have a different barometric pressure depending on their height above sea level, thus showing zero boost at a high altitude will in fact be a manifold pressure above the atmospheric pressure at that location

but the difference will be minimal and most of us live in cities at sea level, so who really cares?

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