Mar 17, 2017 #1 Y Yah's 87 Member Joined Jun 8, 2015 Messages 80 im about to make an adapter that threads onto the driver side fuel rail for a psi gauge , anyone know the NPT for external threads? thankx.
im about to make an adapter that threads onto the driver side fuel rail for a psi gauge , anyone know the NPT for external threads? thankx.
Mar 17, 2017 #2 M mikestertwo Well-Known Member Joined Sep 13, 2006 Messages 5,249 It's not an NPT thread. It's a -4AN thread if memory serves me right.
Mar 18, 2017 #4 Coach Bo ran away with my goat :( Joined Jun 9, 2015 Messages 330 Yes Mark is correct. -4AN...but the thread is 7/16-20