I'm new to Double hose regs. but not diving. I just rebuilt a Dacor r-4. and well, no HP port or "J" valve left me a little apprehensive. So I scrounged through my Boxes of old dive gear and I found a Dacor "K" valve with what could only be a port for a pressure gage. bingo I installed a gauge on the valve and it worked. I was a little concerned about buoyancy So ... with no Auxiliary ports on the Dacor R-4 my solution was to use a pony bottle. I hate having too many things haning off of me so..on my pony I have a mark 25 1st stage with only one hose to a scuba pro air 2. that gives me a safe octo and BCD control. I dont have a pool to try this out. so I have found a protected shallow site scoped out in the ocean.I am aware that 2 hose regs clear different. other than that are there any other considerations that I have not thought of?....... any bodys input would be greatly appreciated
Mahalo
Mahalo