As far as I know, I shouldn't have to do any wiring. My harnes has the conector for the DBW, and as far as I know that should be it for wiring. I realy don't know anything about the DBW on these. When I bought this engine, I had never even heard of DBW, and other than the Toyota recall, I still am in the dark about it. I've had this engine a few years now, but it will be in the car this winter. I just hope I get it all working for next summer.