Im swaping a 3sgte into my 90 gts, i dont konw anything about all the wiring. what do i need to do. try it myself or wont it even be worth my time. or should i send it off somewhere to get all of the wiring done? thanks

i dont konw anything about all the wiring.
that right there is your answer, don't play around with that kind of stuff, you mess it up, mess up some sensors, and you blow your stuff... ship it off, you can get it done in about 2 weeks.