Holley 12-803BP 4.5-9 psi

Here is the site with other holley regulator options available.
Holley regulators

You should be able to get these thru your local parts store that can get hipo stuff.

I believe the first one has: one input and 2 outputs.
I put an elbow on one of the outlets and screwed in a small pressure gauge.
It works great, had it on there for a few years now.