AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual - Manual (Page 293)

EFI Components 287
© 2014 AEM Performance Electronics
Typical boost or vacuum gauges used in automotive applications use the gauge type of readout.
In automotive engineering, the absolute method of measuring pressure is used. To illustrate the
different ways to read manifold pressure refer to the accompanying chart.
We find it easiest to work with the accepted standard of kilopascals (kpa) of absolute pressure. It
is important to know the relationships of the various nomenclatures
of pressure. The units of
pressure in use today are;
1 bar (b) = 100 kilopascals (kpa) = 14.5 psi = 29.529” Hg
1 atm. = 101.325 kpa = 14.7 psi = 29.92” Hg = 1.01325 b