How dare you contradict me?!

You say Tomatoe I say Tomato. I've been building cars since I was 15, now I'm 32, I also sold auto parts for over 10 years, and I've never had a copper oil pressure line crack, look in your basement, what are your water pipes made of? COPPER! And as I mentioned, use an electric gauge if you want to avoid the risk of a leak. And as far as the pipe thread goes, you may be right, however the minute difference between a Japanese/English spec pipe thread compared to NPT is so inconsequential that it's not even worth talking about. I guarantee that NPT will seal. (5 years as an industial machine builder- applications in excess of 1000psi.)