fitting boost gauge to S3

Hey guys.
Gonna attempt to fit a boost guage to my S3. Was just wondering if anyone knew the best vacume hose to go off? Was just gonna tap into the one straight above the throttle body on the inlet manifold but i'm hoping to get a little closer to the bulk head so it looks a bit neater. Anyone got any better ideas?
Also, i'm **** with wiring and electrics. Where's the best ingnition source to tap into so it lights up on ignition?

Any help would be appreciated

thanks

try the vacuum hose connected from the manifold to the solenoid that controls the dump valve.