You can use the MAF wiring to wire the MAP if you want or you can just tuck them..
http://forum.aempower.com/foru....html
That shows bolth i belive.
The sensor pressure readings are measured in bars. the 1 bar will read up to one bar, the 3.5 up to 3.5 and so on. however they are only accurate to something like half of their max reading. if you plan to run 20 psi you will be fine with the 3.5 bar sensor.
What are you using for injectors, i`m looking for a base map.