ok to hook the gauge up, run a piece of vacuum hose from the nipple on the brake servo pipe to the left of the throttle body. It should be bunged up with a green plug if its not been touched before
now u need to run the vac to your boost gauge in the cabin, bcos of the location of the piller many ppl seem to pry up part of the window seal and poke the feed through. as i have a centre console panel im not sure
how to do this sorry but someone will or do a search theres been plenty of threads
it was an easy route for me as theres a small hole in the bulkhead to pass the feed through which is in the passenger footwell. poked the hose through and it was sitting nicely inside
for lighting the gauge on the drivers piller u can wire it into the headlight control switch..again, a simple search will provide u with all u need to know if u ant wait for another reply