Originally Posted by Patrick Olsen
They wouldn't be 1/8" NPT on a Subaru, if anything they'd be 1/8" PT (also known as 1/8" BPT). Slightly different than NPT.
There are a number of 10mm fasteners on the car, can't you just pull one out to use to check?
You're exactly right - they're 1/8" BPT. Will be using a 1/8" NPT tap to make them compatible with some sensors.