I am not running an aftermarket AF gauge and my tuner made no mention of it when he tuned my car.. heck, when I got tuned I didn't even have a boost gauge and had no idea how much boost I was running. I think most FI folks probably think I am an idiot for choosing not to have AF, so take my advice with a grain of salt here.
As far as bungs on your test pipes - you can buy plugs that are threaded the same as the sensors if you have unused bungs.
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