you can download the service manual here.
http://www.lxforums.com/board/showthread.php/24486-new-service-manual-download-link
some of the download links are broken, but there are a few that work. I've used the wiring diagrams for the megasquirt diy install.
Please please please figure out how to wire it yourself with the factory computer and post a how-to.
:d:d:d