boost controller

Okay I'm starting a new thread becuase I've learned alot since I first got my hatchback. I have a 2007 mazdaspeed 3. It has a no name Sri with straightener, Autotech internals, just did a fuel pump seal kit, a tubular header, aluminum flywheel, reproduction factory turbo, egr delete, deleted...

I used to have a 90 DSM and had an AEM TruBoost installed. That car is going away and I am transferring the gauge to my speed. Should I try and use the boost control features on it still? Or should I simply use it as a boost gauge?