Kaylob

I’ve done a motor swap from an H22a Dohc vtech automatic to a h22a4 Dohc vtech manual and for some reason the brake lights won’t work and the car won’t start. All the dash lights come on and everything else seems to be working. When u turn the key there’s no clicking or anything. Does anyone have a clue of what to do. If I have to rerun all the wires does anyone know how I would go about doing that. I also got the wire harness that came with the h22a4 manual motor. There is one grey plug over in the left top corner that doesn’t have anything to plug into what is this for