I have an idea in my head if its right I hope it is I should be ok if not fuck knows lol.
The wires I think go into the car if I'm right I have to work out what wires are what on sierra loom going to original ecu then connect them to the same on the boa loom but theres a few i'm unsure of. I know I got to connect a wire or 2 to fuel pump, and to handbrake/brake pedal and wire to clocks for rev counter