I would recommend doing the PSI engine harness first. Lay it out. Plug everything in, figure out routing, controller mounting, grounds, fuse relay panel mounting and go from there. It maybe much more clear to you what wires you need and where they are going to come from.
Another tip, whe you are routing wiring, use masking tape to hold the wires together till you do the final loom. 5" strip with one end taped to itself (sticky to sticky) so you can open it up to add wire and don't cut anything till you are certain its right.
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