Boost gauge
 

Hi Where do I connect the fitting to without having to drill and tap,it is an NA1.8
Cheers
OD

On top of the intake manifold there are 2 ports just behind the TB... one is for your charcoal canister, and one is for cruise control, at least on US cars. Go to any autoparts store and buy a small plastic t-fitting, cut one of the rubber lines on one of the ports, and splice into it.

If you're asking how to use the POS skinny plastic hardline that most boost gauges come with, then my advice is throw it away. Buy a small brass (5/16" I think) barb and thread it into the back of your boost gauge port and use a regular silicone vaccum line.