Quote: (Originally Posted by
chrisp)

Has this been thought of before? Is there a downside that I am missing? (Yeah, one more failure point, but I think the reward well outweighs the risk.)
Before Closed Circuit Research's Ouroboros and Sentinel CCRs that technology was used in the Cis-Lunar MK-5p, not only for the O2 and dil inside the case, but with optional pressure transducer also the two tanks that can be mounted on the outside.

DeltaP offers a version of the Universal Rebreather Monitor that reads a single cell and two HP transducers. Can either be used with a 4th cell, or replace one of the stock displays.
So the technology is there, but it's expensive, and I gather there aren't too many takers of this version of the URM. The triple sensor version without the HP links is more popular as Jetsam offers it as a factory option.
One thing though, as any display and warning, it'll only do good if you watch and heed it.