I just bought a Carter MuscleCar Series Pump and it put out between 7 and 9 lbs with the Gauge Shaking all over the place.
I found an Old ProFuel InLine Adjustable Regulator and I wanted to have a Gauge as well...
My Routing was a Mess, but at least I got a Stable Pressure at 5.5lbs with 5 Hoseclamps between the Filter and the Carb.
It's all 5/16" stuff.
I like the T for the regulator and gauge that saves me at least one connection