mustangsel

I ripped out the engine, tranny and whole front suspention on my 97 GT a few days ago. (I have a 04 Mach 1 engine to through in it) So today I changed the pedals, the master silinder and brake lines. So then I started to take out the old harness out of the engine bay and as I was going along I found that I had to keep ripping every harness out because it wouldnt mach up to the new harness. I changed every harness in the front of the car up to the cumputer. Then I find out that the old dash harness wont plug into the new harness. So my question is, what went wrong?? I think that I should put all the old harness' back and just change the cumputer and see if I can plug the new engine harness to the connection by the firewall. If anyone can please help me out with this. I've seen it done before but I think I'm f*cking up somewhere. PLEASE HELP!!!!!!!!!!!