Yeah if i were you id search alot more on this topic, not to be mean but some of the questions you asked lead me to believe your not quite ready to turbo yet. i searched and searched for over a year before i turbo'd mine and i still dont know alot all i know is im boostin and my car is loving it. You mentioned 2 things that caught my eye and im gonna give you my advice based on the two things you said imo
1) you said your at 115000 miles but have 200 across the board and your internals are stock
Your ok to boost imo under these conditions, because your internals are stock your limited as to where you can go with it so lets say 8psi is your max, your only fuel mods should be some kinda fuel managment (fmu, Sfmu) i went with the vortech Fmu 12:1 disk, a walbro 255 fuel pump, might as well replace the fuel filter while your at it and your done. i would definatly use the missing link, it dumb proof and an easy install. forget the safc with your internals and set up you not gonna need to get into that degree of tuning and that brings me to your second statment.
2) i dont wanna blow my motor, joint the club i dont think any of us do but ill tell you this you start adjusting fuel curves and messing with the safc and have not a clue as to what you are doing you will blow your motor and youll do it quick. imo you definatly will need the intercooler and make sure you have no leaks at all! as for gauges, a good boost oil pressure and a/f ratio will work (yes the blinky one is ok for no more than the boost your gonna be pushing) if you want you can get a fuel pressure gauge to be sure as well but its your call

look at my set up in my sig. im pushing it right now cause i boost up to 10psi from time to time but so far no issues but my motor is built. id keep your set up at no more than 7psi and just watch your gauges and make sure all your vacume lines are good and tight.
turboing my car has been the best thing yet since ive been a member here and i know i would never have been able to do it myself without the info on this site. search, read and learn. we will be here for the rest
joe