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Originally Posted by Justang
That is technically true. So I was technically wrong.
But, if we want to be technical, why do the boost gauges read 0psi, when it should read 14.7 (at sea level)?
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Cause the boost gauge is reading the different in pressure between the outside (atmosphere) and the inside of the gauge (what it is connected to). This is often called psig; where the 'g' stands for gauge. To get the absolute pressure (psia) you have to add the atmospheric pressure to the psig.