sage I have two in-tank pumps that run simultaneously. They feed through a -8 to that Y block. The third pump is in the other side of the saddle and is fed to that Y-block with a -6. Haltech triggers it at 34 psi. No Hobbs switches. I do have a Y block that is before the rails. I plan to switch to PTFE after the filter next time it’s on the lift for peace of mind. The stainless rubber hose will be fine for quite a while though. Stock return handles it well.