Have a 1990 nissan pintara with the ca20 and want to isntall a splitfire vacuum gauge but have a problem,

What line is the vaccum line i have to cut to put tpiece in? i havent got a clue.

i've put a vac guage in my car, its fairly simple, just dont cut the wrong thing.

u need to find a hose coming from ur manifold, not before ur throttle body as some people think. u will have one for ur brake booster, but usually its fairly large for wat u need. i think the one i found was going to some sort of sensor, it was the right size so i used it, and it all works fine. just find any small enough hose coming straight out of the intake manifold, cut it, put a T peice in it for the hose going to ur guage, u should be fine