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You do nothing. The reading from the barometer is absolute pressure.
Low pressure
Gives a reading of what the pressure in the system is.
Arterial pressure
air pressure
gauge pressure
I'm not a mechanic / technician but I've heard of a plugged PCV system ( valve, hoses etc ) blowing the oil dipstick up off its seat - but I don't know if that raises the oil pressure reading on the gauge ? ( of course , there is a normal change in oil pressure from idle as the RPM's go up - to a point )
Second
149 psi
Air pressure
NO it will not.
the pascal