The wire colors for the EFI relay are blk/grn, wht/red, wht/blk, and blk/yel. These wires are in the same harness as the wires for the starter relay. I cut the wires long enough to mount them under the dash. Gittinit not sure what way I'm going to go. I really like the 4runner and I like flatbed trail trucks. For now, I'm just doing the motor swap on the truck. What would you do?