A couple of other ideas to consider are:
Awaps bungeed dollar store magnifying glass. The Master attached a small magnifying glass to his hp hose near the SPG.
And here’s a trick an Old Mossback I used to dive with used. He took a piece of black electrical tape, poked a small pinhole in it, and taped it to the outside of his mask in the lower left corner to use the pinhole effect to read his gauges. It worked for him, but as I’m just now nearing that period in my life where I might be able to personally verify it’s worth, I'm not there just yet. However, I would be interested to hear if others have tried this with any success.
c