As I plumb the new pad...just a thought.
Does a coupling or tee exist that you could screw in a pressure gauge for evaluation or troubleshooting? Would it be desirable to have some of these in various places on the pad?
You could make one by using a tee and a slip/thread bushing, but maybe it would cause turbulence and restrictrion to flow...
You'd probably normally run with a plastic plug in the port, and just screw in the gauge when testing.