Perhaps I'm showing my age - my OW cert was PADI in 1978, and that is all I have ever done. Both the octo and gauges are tethered on my rig - the octo on a velcro tear off, and the gauges on a snorkel keeper on the hose clipped to a d-ring on my BC . . . that keeps them out of the mud, but leaves enough slack to read (and thus flop about) so I take both in my left hand, and hold when entering, and right hand on the mask/reg on my face . . . Not that it's the only correct way, but if I don't hold, the octo can come loose on entry, and then I have to fish for it. I can't stand a free dangling octo, gauge, or anything for that matter . . . I also don't use the combo octo/inflators, which would negate most of the need to hold. I only use a full duplicate 2nd stage on my regs . . . Once I enter, I verify no freeflow on the octo, and pressures, etc. on the gauges, and then proceed with my decent.
- Tim