Where to fit Turbo vacuum dial silicone tubing?

Hi all,

I own a VRS 2008 diesel and have just installed a turbo gauge. I've managed to feed all the wiring and tubing correctly and connect the (+) hard wired to the fuse box inside the drivers side 👍 The (-) connected to the battery safely so that side of things are all done and it's working per say... The only thing I need to do now is connect the silicone tubing to the turbo intake piping but I'm hoping someone can direct me (with a diagram) preferably to where I need to connect it please? Otherwise I'm just left with a gimmicky dial sat lit up doing nothing 😂 Thanks in advance 😊