Originally Posted by
megan
The boost gauge is an absolute reading also, it will read zero at sea level ambient pressure, where as a MAP gauge will read just under 30 inches, eg relationship is as follows,
Hate to labour the point, but in the strict engineering sense a device which reads zero at normal atmospheric pressure is
not reading absolute pressure - the terms
absolute pressure and
gauge pressure are not the same in the engineering world. A bit like weight and mass which are used interchangeably in common parlance, but in the scientific and engineering worlds they are different.
If a boost pressure display was reading
absolute pressure, then at sea level, normal atmospheric pressure, blah blah blah, it would read +14.7, not zero.