I purchased my stereo from cruchfield also and I just wired the Empeg and my JVC head unit to the harness that cruchfield provides. You can see my installation at: http://www.riocar.org/modules.php?set_albumName=album39&op=modload&name=gallery&file=index&include=view_album.php

Also, some cars do not provide enough power for you to run the head unit and Empeg off the same power source, so you may need to run a new power lead directly to the battery. I had to do this in my wife's car. She has a 2001 Crysler Sebring, which is basically a Mitsubish Eclipse. I also had to replace her center console with one from Mitsubishi to support a double din install, because the Chrysler head unit was 1.5 din.

Anyhow back to the separate power lead. I just ran a 12 guage lead with an inline fuse to the positive lead of the battery to the yellow power lead on the Empeg. For the other leads you can just attach them to the harness provided by Crutchfield.