OD pressure
To increase pressure to OD will require a line pressure increase. IF line pressure is to spec and OD pressure is low, it may be showing a leak in that circuit. What is your line pressure? What is pressure in OD? Would be best to check with two known good gauges. Connect each gauge to LINE and check readings. This will allow you to see possible difference in gauge calibration. Then connect one to OD and drive. Hope this helps
James Northum