It doesn't matter. The tank pressure gauge will read low in the keezer. If you keep it outside you'll have to run a high pressure line and drill through the collar. Either way works.
Of all tyrannies, a tyranny sincerely exercised for the good of its victims may be the most oppressive. It would be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience. - C. S. Lewis, English essayist & juvenile novelist (1898 - 1963)
I am toying with the idea of rigging a quick disconnect to the backside of my keezer lid. as of now I can only have 4 kegs on deck with my 20lb co2 tank inside. or i just make a mini collar so I can get my o2 line into the keezer.