hey guys, i am putting a boost gauge on my truck and i plan to tap a hole into my intake horn but i dont know what size to make the hole? i have my stock boost elbow from my turbo and i plan to use that to feed boost pressure to my gauge.Now, i am in one of those situations where i needed this to be done yeaterday so its not like i can order the right fitting unless that boost elbow wount work, then i have no choise so if you could help me out with the drill size that would be great.

 

NBoost bolt. No drilling just take a plenum bolt out and install in its place. Much cleaner looking install .
Bit size and tap for your elbow would be size r, size q or 11/32 and 1/8th npt tap
But plumbing it this way can cause boost leaks at higher boost pressures
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why not spice into the waistgate hose on the bottom of the turbo? did mine there had no issues

 

yea i think i mights just use the waistgate hose. i just hope i have enough vacume line to reach

 

I made my own boost bolt drilled out a bolt pressed in a barbed fitting works fine,but I forgot where I got the fitting from, this is not hard to make