u mean "speed density". there are a few differnt ways to do it.. one is a PITA and is expensive and one is fairly easy and affordable..
the first is to buy s conversion kit..uausally about 3-6 hundred and that comes with
-whole ecu harness (u have to take the dash out to get it out and back in) and if u are lucky it will have the same plugs as your car...(mine didnt)
-mass air meter(uausally stock)
or u can peice it together yourself and get better parts...