finally got one

Ok it's been a long time since I poated anything. My PROCHARGER kit should be here tomorrow and I'm finding out I need a few more things for my install. First my tuner is trying to sell me this MAFia plug in for my Diablo, do I need this? I havent heard of this from anyone else, and they say these kits are ready to go with just the tuner.

Next I'm installing a fuel pressure gauge, come to find out I need a fuel pressure adapter. My tune shop did not have what I was looking for and I want to know what you guys recommend.

Thanks for your help......