I have a 88TII and I am in the process of switching my JDM UIM with a USDM UIM for emissions purposes. Just need to clear some things up.

I have four nipples in a row on the side of my USDM UIM that is closest to the firewall.
From top to bottom:
1.
2.
3. Oil Bleeder VAC Spider
4.
could you guys help me fill in the blanks? i know one is for bleeding the primary injectors, another is for a secondary injector bleeder nipple that i don't have. but what order do they go in and WTF does the last one go to?

I also have a Huge nipple sticking out towards the firewall Is this for the brake booster?

 

Try these threads.

S4 Turbo
https://www.rx7club.com/showthread.p...=turbo+nipples

S5 Turbo
https://www.rx7club.com/showthread.p...=turbo+nipples