Can you please explain to me how this primary works. Tuck the backup in the pocket and do not use it unless your primary fails. How is your brain, and nothing else, going to know how much air you have in your tank?
An AI computer -IS- an SPG. It has the same function.
As I said before- my husband's computer does "remaining air time" with 500 PSI as 0 minutes left. He uses this to plan to be back on the boat with 0 minutes left. How is this any different than me using my SPG and planning to be back on the boat with 500 PSI?
pay me, and ill teach you