boost gauge?
#2
MBWorld Fanatic!
I can't give you specifics but I can tell you what I did on my old coupe. You want to measure boost by the throttle body but luckily you are not the only one that needs this so there's usually a vacuum line just before there that you can use a T to splice in there and attached the boost gauge to. Also there maybe a vacuum line port that's capped off for diagnostics somewhere. I learned about this after I did my splice on my old coupe but I don't know where it is on the newer motor because I didn't have the urge to do this yet.