I use the Fuelab 51506-1-L-L. I got it from
Speedway. I has a range of 1 - 3 psi. I have an in-tank pump and run the supply to the fuel loop (at left below) and then to the regulator at the end of the loop. The left port on the regulator is plugged and the bottom port is the return port. I have no problem keeping a steady 2.5 psi at the loop.
You can't see the regulator, but it is mounted to the firewall.
Tim