1 & 2: your wiring is very wrong from what I could tell from your old thread. At this point, it would probably be best for you to get new harnesses and take it to a shop to have them restart the wiring.
If you don't want to do that, remember that the SR has some unused harnesses.
http://www.frsport.com/sr20det-swap-...r20-p-665.html
3: You can try lifting the rear off and spinning the wheel, or try looking for the sticker. The best way is to take off the rear diff cover and take a pix. People will know just by looking at it.