I used a Marshall 2 stage regulator Here
I bought the tank adapter and had a local fluid power shop make me a 3/8" propane hose and put it together myself. You can buy low pressure regulator assemblies cheaper, but the 2 stages are supposed to be more efficient. And you want to make sure you get a 3/8" hose, some of the assembled ones only have 1/4".
Low pressure/high pressure will depend on the burner orifices, but I'm not that familiar with those. I used banjo's.