Abaqus - Hydrostatic Pressure Load Coordinate system

Hi, I have geometry that I have imported into Abaqus. I would like to use the hydrostatic loading condition on this geometry. This loading condition varies the pressure in the Z direction. The imported geometry has a default coordinate system which does not have the z axis in the orientation I would like it to be. I have created a local coordinate system in the model that has the correct Z orientation. However I am not sure how to "assign" this coordinate system so that the hydrostatic load uses it. When I run the analysis the pressure is varying along the Z direction of the default coordinate system not the local one.