The absolute pressure is related to the gauge pressure using the following formula:
Pabs = Pg + Patm
where
Pabs = absolute pressure
Pg = gauge pressure
Patm = atmospheric pressure
In units of kPa, Patm = 101.325 kPa.
Pabs = Pg + Patm
319 kPa = Pg + 101.325 kPa
Pg = 217.675 kPa
Thus, the gauge pressure is 217.675 kPa.
