Paula, I don’t know what your intended use is, but oxy/acetylene is
generally overkill for any jewelry-related work. Too hot. It can
easily melt, cut, and weld steel. I’ve been doing silversmithing for
35 years and have both a Prestolite setup as well as oxy/acetylene.
The Prestolite is for jewelry, the two gas rig for steel. If,
however, you do plan to use it, it depends on your tip size. If you
have a #2 tip, a good rule of thumb is about 4lbs acetylene and maybe
double that (8PSI) oxy. You can try them equal (4 and 4), and bump
the oxy up as you try it, to find the setting you like best. Let us
know how it works.
You might want to simply check out the Miller and or Lincoln
websites for info, they’re pretty good.