Installing aftermarket boost gauge, need some info

Ok, since I installed my latest mods, BTM 10% pulley, 180T-stat and Intercooler Fan, I'm pegging the boost gauge even with my high-flow exhaust set up so I bought an auto meter boost gauge that goes up to 20psi. I would still like to have the one in the dash working so I know I need a T-Fitting. Does anyone know the size of the t-fitting that I will need and have a part number for it and a place that I can order it from? Thanks in advance.

u should be able to go to ur local hardware store and find some fittings, just but a couple of different seizes, it shouldnt be that expensive, and the line is easy to cut, just need a snips, thats what i would do first