New Split Y from Intake Manifolds
I don't know if any of the SRT6 guys had this problem before but finally, after so long, I was able to fix my boost gauge readings issue. My boost gauge was originally installed on my SRT6 when I bought it. However, despite I upgraded the stock supercharger pulley with a 65mm, the max boost reading I seen is 14 psi at WOT.

After reading a couple old treads I find out that if the gauge fitting is installed in just one of the intake manifolds, I would get partial reading of the boost readings out of the charger.

So, today I got new lines, fittings and the tools needed to fix it. I carefully drilled and tapped another fitting in the other intake manifold. Then, I connected both lines coming from the intakes with a Y fitting as shown in the picture. Then, I just reattached it back to the line coming out of from the gauge. The result were positive. I finally got better and accurate boost reading. Now, the gauge shows up to 10psi in a mild/short acceleration and up to 16psi of boost at WOT.

So, within the next weeks I will be replacing my cheap eBay boost gauge with a new digital Prosport Evo gauge and a Prosport A/F gauge. They will be pairing my existing Prosport AIT gauge in order to proceed with my fuel mods and 63mm supercharger pulley. I'll keep you posted!