1) DIR gear is for in the water, not on the surface. If you don't need it in the water you don't take it.
2) A boot is rarely going to add any meaningful protection to a gauge that has a tank dropped on it unless it is huge. This introduces a non-streamlined item that is not needed and not DIR. (A simple boot is less obvious particularly when geared up in a drysuit, etc. But, every little compromise starts to add up.) The arguement for valve protectors while on a boat is just as valid but everyone generally accepts this as completely un-DIR. Gauge boots are in the same catagory.
3) I am a total klutz and trip or break minor stuff more than I care to admit. Even I have never impacted a gauge as described above. The better fix is to be more careful and just accept that there is some small chance a gauge might get broken on the boat. You can easily carry a spare. Personally, I always have one extra stage reg with me which provides most of the needed spare reg parts, including a gauge (albeit a temporary plastic one).
2) A boot is rarely going to add any meaningful protection to a gauge that has a tank dropped on it unless it is huge. This introduces a non-streamlined item that is not needed and not DIR. (A simple boot is less obvious particularly when geared up in a drysuit, etc. But, every little compromise starts to add up.) The arguement for valve protectors while on a boat is just as valid but everyone generally accepts this as completely un-DIR. Gauge boots are in the same catagory.
3) I am a total klutz and trip or break minor stuff more than I care to admit. Even I have never impacted a gauge as described above. The better fix is to be more careful and just accept that there is some small chance a gauge might get broken on the boat. You can easily carry a spare. Personally, I always have one extra stage reg with me which provides most of the needed spare reg parts, including a gauge (albeit a temporary plastic one).