ORIGINAL: proptop
It should be OK...you obviously know to be very careful of not over-tightening...
Those Alum. fittings sure seem fragile don't they?
Maybe get a heavy duty Brass one instead, for added peace of mind? (less chance of it breaking off later on from vibration? )
Mac's sells 'em...and I think Fox does too...
Oddly, I'm not concerned about the fitting itself. I'm more concerned with the backplate. The metal is very thin on the inner wall of the backplate. Maybe 1/16" thick at best. I have some brass fittings, but they must be 4-40 threads. The fitting that came with the pump is 6-32 and thats what I tapped it to not knowing the fitting wouldn't seat all the way.
I put it in with locktite on the threads, and RTV on both sides of the gasket and snugged it up as tight as I was comfortable with. If it falls out, it won't get lost because of how the radial mount is attached so worst case scenario if it falls out I have to retrieve it manually.
I'm going to plug the pressure fitting hole in the muffler, too since its not needed anymore. (of course this is the wrong thread too)