Belzelbub
Contributor
Exactly. I’ve never seen a diver run two SPGs off of a single reg. If it’s fine to run just one, it’s fine to run just AI.Have AI or have an SPG. Having both is the worst option.
It's funny how basically everyone agrees that it's fine to have just one SPG and no AI. But, some people will say it's not okay to have AI and no SPG. Essentially, that is hypocritical.
Yes, AI can fail. But, so can an SPG. Your procedure following a failure is the same, either way.
These days, when talking about a PPS or Shearwater transmitter, I don't see any evidence that SPGs are more reliable than AI.
Mechanical parts can fail, electronic parts can fail. A failure of a pressure gauge (SPG or AI sensor) is not necessarily a cause for concern if you’ve been watching your gas. Electronic parts often fail on startup, and when they do fail, it’s usually hard to miss. A blown OPV will have a lot of bubbles, and no communication. A dead battery or otherwise dead transmitter (flooded, etc.) will also have no communication. A failed SPG can stick at 1500 psi, that might not be detected right away.