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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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galling won't be your problem, but the dissimilar metals will be. Chris has the right idea, IMO. Teflon (PTFE) properly applied, will be a lower risk solution than waiting for tin precipitates out of the brass to oxides. ...or is it the aluminum oxides that will go crazy? Well, anyway, you want to insulate the dissimilar metals; else deal with whichever metal-fur will grow best.
..And the fact that you have NPT threads helps make the teflon tape more stable --tapered threads, rather than a hard stop flange.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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