apexi SAFC

sup. i have 91 crx si. my friend has a apexi SAFC that he's going to sell me for dirt cheap. what exactly is this thing used for? the only real problem is he only has the screen & a plug on then end of the wire. ill take pix later on, but what i want to know is what else would i need to buy to hook this thing up to my & make it work? thx all for reading my post.

you might wanna ask this in the honda engine performance area