PCP fill probes are such a joy, I'm replacing mine with a quick disconnect.

They should all come that way!!!

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That was always my thought too!!!

Possible problems. First couldn’t you have the probe get loose and then lost. Second it sticks out and could get snagged. Lastly you really should have a plug or cap on the disconnect so you then have that to deal with 

Not convinced it’s a better mousetrap 

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Good points. Thought of well before bothering to measure anything though actually. 

First you couldn't pull it out with pliers. Threaded in. Second it's a long range bench gun, not much to snag on. But I can guarantee you, that you couldn't harm it (or the gun) if you snagged a door jamb walking through the house. Lastly not important to me. Too many guns working just fine without that. I do get your point though. My guns will have a quick disconnect condom when I go to a dry dusty shooting area just in case. 

I did not understand that it was threaded in. That reduces most of my concerns

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That's because I don't usually describe things to well. For me, as dumb as this sounds. I probably spent more time thinking about if I was going to like the finished look or not before I started boring holes in things. 

Only used it twice yesterday. Hard to believe such a small thing can seem so convenient. Clip on, clip off and no probe hanging off the hose. 

I'm doing the same on my wildcats. I have aftermarket fill probes that end directly in disconnects, no threaded adapter needed, and just leave them in the tube.

Someone needs to make a tube end with the gauge and rotating fill cover.... but the cover rotates 90 degrees to reveal a mounted male quick disconnect entering the unit from the side !!!!

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Whatever works. Very often the simplest solution is the best one. 

Your idea to reveal a mounted male quick disconnect entering the unit from the side !!!! - That's the ideal design in my opinion also.I was thinking about a similar design. Even started measuring to see if it would fit my gun. Could easily be done. Then I thought about how much of a pain the existing spring loaded dust cover always was. I've used a quick disconnect on a LCS sk19 enough lately to know I just wanted the thing sticking out there. Apparently I'm too lazy to open a dust cover.....