You will say where have you been all my life!? when you get one of these quick-chucks for your compressor! But seriously, you will kick yourself after for not having something like this before. Major game changer airing up.
I have one with my Powertank CO2 setup; it's handy but not infallible - sometimes I have to set/clamp it two or three times for it to seal well. I like the built-in big easy-to-read dial pressure gauge as well or better than the quick chuck.
The Powertank gauge/chuck combo also has a button for airing down.