i have two vacuum oil lines on th e 3.0......
one with a small orfice to the rear of intake boot,call it A
...one with regular size hose from back of boot-call it B

two vacuum oil line contections on the 914-6 tank....
one at top of oil filler...call it C
and one at middle top of tank..call it D
so tell me which one goes where???

Show me what you want Pete and I will reply with a photo.
I think B --> C is right.

there is a moratorium on pics until i turn over the key....
the boot has been modified a bit....
the vacuum is beeing run off one outlet on the boot close to the fuel distributor...i one has the pencil sized orfice, the other has none...
by the way john i got it to fit nicely by dropping it all the mounts one inch....yippie

Your 'D' on the tank is input from the engine breather....off the top of the motor.
Your 'C' on the tank is output for the tank.....a breather line hook up. I run this to a catch tank.....some just hook up a breather filter there....some use this as a return line to the engine air cleaner....this is the stock 3.0L method in a 9eleben SC.
*If* you're planning on doing autocross, the catch can is a gud idea.