SKF 1077589/3 [1077589/3 ] Pressures Gauges, G 1/2, Accuracy 1% of Full Scale , 0-400 MPa (0-58000 psi). SKF pressure gauges are designed to fit SKF hydraulic pumps and oil injectors. The gauges are all liquid filled and/or equipped with a restriction screw in order to absorb any sudden pressure drop thereby preventing damage. Safety glass and blowout discs are standard for all gauges and all have dual scales (MPa/psi)..