I know this question has been asked alot. I have a couple of good posts saved. Does anyone have personal experience with wiring an st205 engine into an st? I know wiries need to be lengthed and the fuse box plug etc etc. I am going to need some help. I have a 7a wiring diagrams and st205 wiring diagrams. Is it pretty self explanning what pinouts need to be repined? What I don't really know is what needs to be dome to the 3 interior plugs above the ecu? Any help would be greatly appriciated. >> thanks lance

1st step, remove the wire looming and label every wire using your wiring diagrams. Once you do that, it will start to make a lot more sense.

You dont have to lengthen the harness if you tap another hole in the firewall. I did this because the less cutting and soldering the less likely to have a voltage problem.