CA hoses - intake manifold

[Ilumis]

i have a problem with my new s13 ca: there are 2 small hoses coming from intake manifold, near the pulley (pic->yellow+blue). the yellow one goes with a t-piece to the boost gauge (the 2nd outlet from T i have closed now becuase i dont know where it belongs to!?). there is indeed a 2nd hose from the intake manifold (blue) but this already got closed by the previous owner. is it ok how i do it? where goes the yellow hose original?

http://img111.imageshack.us/img111/4060/bild0152bt.jpg (http://img111.imageshack.us/i/bild0152bt.jpg/)

greetz