Dan Gibson:This was JJ's response to my question.
"This one is a tad goofy. I have found that stages and hip clips are best
placed below the gauge with the gauge on top but if I am using a leash with
multiple bottles that it is best placed at the very top. In this way the
gauge is always reachable. Other configs will work in most cases but
especially when towing a cluster of bottles it is hard to free the gauge if
you allow it to be trapped below the tow leash."
The only thing different than what I learned is the leash position for multiple bottles which seems pretty logical when you think about it. Since I have only carried one stage and immediately drop my O2 in a cave, it hasn't applied to me up to this point.
Let me add to this that, once you add tow leashes, etc. it is a mess and really does not mater. I often put it on the bottom, not because it is easier to reach but because I will rarely access it and it gets it out of the way more. Having said that, once you make the mistake of letting off the trigger and (when towing non-helium mixes on a leash) all of the tanks drop down, it is a real mess if the leash gets around the gauge. Clipping the gauge on the top reduces this problem. (Doesn't fix it.)
What some people used to do was take a small oval clip, the kind you screw back on, and attach it to the hole in the bottom corner of the plate. This is where the gauge went. In general, this is a bad idea and not a good long-term fix. So, while it may seem difficult to reach when you are first getting used to stages, keep in mind that long-term it really isn't that difficult and dealing with it getting in the way becomes a bigger issue than ease of reach. (The gauge gets in the way more using the alternative clip approach.)