Thanks for posting this, Frosty. I was having a lot of trouble tapping the fittings I picked up locally at Menards. It seemed the ID was slightly too large to get a good tap (the MIG tip would move slightly when screwed in.
I ended up buying some from an online supplier. Here's a link: Supply House.com. The brand is Jones Stevens and they tapped much better than the ones I picked up at Menards. Just sharing for the other newbies that are starting out like I am.