I'm assuming you just went single, I have mine zip tied together neatly, some completely eliminate the wire from the harness for a cleaner/ professional look. Goto MKIV.com and search in the tech articles to get rid of the CEL, involves installation of a few Radioshack resistors. As far as the hose you're inquiring about... you need to take a better picture of the surrounding are for us to get a better idea but it appears to be the one plugged into the canister mounted below the intake mainfold, I would block it.
Kruso