assemble your twin tank diving set in 2 minutes

[@oogdiver]

Speeded up video and no primary or back up lights?

[@lexus82su]

No pressure gauge on the long hose 1st stage?

[@arctic_ita]

You could add another for redundancy, however it wouldn't be a common setup. Differently from a side mounting setup (separate tanks, hence separate pressure gauges) In a twinset both the tanks are always connected by the manifold, so the pressure gauge will always measure the shared pressure. The time you gonna close the manifold isolating a tank during a dive it's only because of an issue, in that case the dive is considered aborted/terminated and you gonna end it, at that point, even if the active circuit (the one where you're breathing from) is the one without the pressure gauge, you don't care much because you had enough gas to start with to finish the dive (a/o to switch to a deco bottle).