Not sure how many people have run across this problem, but I thought I would post my solution.
I need to mount a fuel pressure sender on the fuel rail, but no one makes AN4 to 1/8 NPT adapter. The LS dakota got a hobbled up 3-piece adapter that cost way too much money for what it does. So I decided to fabricate my own adapter from a very inexpensive AN4 female to AN4 male pressure port adapter. Initially, I planned on capping the AN4 male end, but it was too long to fit under my engine cover. So I cut it off, tapped it for 1/8 NPT and added a brass plug from Lowes. Now I have the option of straight or 90 mounting location.
LSDAK 3-piece adapter.
Started with this.
But it wouldn't fit under my engine cover.
Cut the male end off.
1/8 tap.
Drill it out with appropriate size drill bit. In this case, 21/64 drill bit.
Tap, thread in 1/8 brass plug. Done.