I want to put a Hemi in my other 98 Durango. I know I need the Hemi motor with harness (have), tranny (have), and 2004 RAM PCM. Now my other Durango I used a Hotwire plug and play harness, but lost cruise control. How can I write these up myself. Sometime said the harness you have to fabricate is the one going in the fuse box. I'd this correct?