tre5
+1y
There is a pressure guage that you can run. It will tell you your line pressure. Or... the better option, get the same ride height sensors that they use when bagging. There is no reason you can't use them the same way. I am not sure why more people don't do them. But, then again I have had the option several times and never really cared enough about it. I just go by feel, or the head out the window.