Hey mate.
I'm running a 16v turbo engine
The 3 nipples together.
One is for my fuel pressure regulator
The second one is for my MAP sensor on my ECU and the third goes to my boost gauge.
The two at the front I have one blocked off and the other goes to my BOV
But I'm not sure if I've set that up right as it doesn't seem to be working haha
Hope this helps