wow, well, you've got several options here
A.) go online, pole around and then buy the harness that makes it a plug-n-play 5 minute job.
B.) do it the hard way and hardwire that junk in. which would help if you went to greddy's website, or search around the net for where all the wires are supposed to go. i.e. the 12v source, the IGN source etc.