I read a thread somewhere that showed a whole bunch of adapters to go from the 3/4" NPT hole on the intake (24V) to the 1/4" line that goes to the boost guage.

I didn't like the looks of that, to many places for a potential leak.
All I did was drill and tap the 3/4" plug that is removed from the intake and install the 1/4" fitting directly into the plug.

Reinstall the plug, hook up the line and it's good to go.

Just be sure the hole you drill is perfectly centered otherwise the fitting will not fit correctly.

Sorry, no pics.

Doug