im asking cause it would be easier to fish through the firewall but will it be accurate and not pop out of its fitting? or should i go through the trouble and use standard rubber vaccuum hose?

also are most of you tee into fuel pressure solenoid or intake manifold to bov line?

 

I have the gauge that came with the Warrtalon package, which has nylon tubing. I tied the t fitting into the factory boost gauge line so I didn't have to run anything through the firewall. I swapped my radio and gauge postion prior so it was easy. I zip tied the t into the rubber factory line and it has been working perfectly. I also used the yellow wire running to the factory boost gauge for power.

Using the factory power and boost lines couldn't be any easier.