Yeah sometimes its a lot to take in for being new to this type of stuff. Just read and if you any questions on the info your reading feel free to ask but yeah research it 1st.

Just echoing what everyone else said. Get rid of that Air/fuel gauge it's practically useless. Here's a list of what you need with most important at the top.

- Wideband O2 sensor (I recommend , if you want to add other sensors like boost/egt/fluit temps, etc)
- Engine management - ECMLink will probably be best for you
- Data Logger - comes with some management systems. If you get ECMLink you'll be set for tuning and data logging
- Boost gauge - I'm assuming you already have one of these.
- Injectors - you've got them
- fuel pump - you've got one

Once all that is lined up you can actually start turning up the boost and tuning. Until you have fuel control (engine management) you *should* be safe at 16psi, but that's just a rule of thumb. If your car is having issues and you are leaning out or something you can get detonation. Your knock sensor should detect that and pull timing. The only way you'll know this is happening without data logging is that your car will pull like it has no power even though you've turned the boost up.