Fluid Mechanics Pressure Measurement

Which of equation represents the correct relation between absolute pressure Pabs, atmospheric pressure Patm, the gauge pressure Pg, vacuum pressure Pvac?

1
Pabs = Patm + Pg
2
Pabs = Pg + Pvac
3
Pabs = Patm + Pg - Pvac
4
Pg = Patm + Pabs + Pvac

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