I am looking for help with a few questions. I have a complete LS2/T-56 with a complete harness (from battery connections to every plug). I have ordered the E40 J1 Harness Assembly from EFI Connection. I still need to get the DBW pedal. I have the harness pinout info from Patooyee to wire in the J1.

I need to install fuses and relay, should I just make my own or would it be better to get a factory one off of eBay.