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I can't tell you how insulted I get when my buddy asks me how much air I have left..... right up till I run out. If it were me, I would get a couple of Galileo Sols with buddy check feature, a couple of hockey pucks for backup, and a couple of brass and glass gauges for pressure backup. That should be enough toys for you for a while without introducing any failure points. When you need more toys, buy a rebreather or 2.