If you watched the Dash 5 tune up video, that is the fitting on each pump you tie into to read the actual oil pressure on the servo piston. The pressure reading will be situational. When the Jet Sensors are at 300 PSI difference on their end, you set the NC pressure at 70PSI coming out of that fitting. When setting the cut out, you put a function like boom or stick over relief with the mode in H0 and H and the main reliefs set at 4,500 PSI, the pressure there should be at 70 PSI. After those are set in the right situations you can set the TVC for how much RPM you want to pull out of the engine. I'll add or subtract TVC pressure to get about 150 RPM drop on the engine. After all that I go back and check and reset the NC and Co as needed.