I'm in the process of putting together a Megasquirt 3 setup for my 92 RS, and i've run into a little trouble with my fuel line fittings. I'm using an Edelbrock Pro-Flo XT intake and fuel rails, and I can't seem to find the right fittings for the fuel rails. I found a few different sites that listed them as taking 3/8" NTP fittings, but the ones i've tried clearly do not fit. They thread in 1-2 turns, then stop. They don't seem to want to move any further without a lot of force. Anyone have any idea what fittings are supposed to work with these? Are there 3/8" NPT fittings with different pitches on the threads? Thanks for the help.

 

I'm interested because I am contemplating using this manifold. I think it is best if you contact Edelbrock, or even Summit Racing's helpline. Summit could possibly pull an intake for you and verify a fitting.