Relative Pressure is when you disregard that we are at all times surrounded by atmospheric pressure (approximatley 14.5psi). Therefore if a container is said to contain 10psi relative pressure, it's aboslute pressure will truly be 10psi + 14.5 == 24.5psi.
An editor that displays in Relative Pressure looks like this:
Column 10 is approximatly atmospheric pressure, slightly less due either to interpolation or the fact that even at WOT there will be some vaccuum.
Column 1 is somewhat arbitrary, and not true zero aka absolute vacuum.
See also Map Sensor for the values the OEM Map Sensor is capable of reading.
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