John Bantin
Contributor
Even English/standard units there are differences. A gallon? US or imperial. (hint: American cars get lower MPG because the gallon is smaller). Pipe thread, 1/8" pipe thread should be simple enough. No, there is NPT (National Pipe Thread) and BPT (British Pipe Thread). difference is 1 thread per inch. And most of the world runs BPT. Japanese cars will have BPT threads on them to this day.
Don't the Japanese also drive on the same side of the road as Brits? (Handy for having the whip hand.)