Well since Diesel doesn't have ENOUGH vacuum you cant connect it like a regular gauge,yea more info on the boost gauge, what's it hooked into??
1) Tap into intake manifold - Something about metal didnt really intrigue me.
2) Hack into the Hot side Of the inter cooler (hose to throttle body). What I did was make a small adapter. Cut the hose. Installed the gauge assembly and clamped it with 2 t bolt clamps.
Confirmed there is no leaks.
It works great. I havent had the time to color match the gauge but so far it will do.