[PDF] 1UZ WIRING INSTALL INSTUCTIONS - North West Toys that the ORS wiring harness and the 1UZ-FE engine wiring harness leads will reach the ECU and plug in. If the vehicle does not have A/C it is possible to mount the ECU behind the glove box. 15) Route the transfer case (and sometimes reverse light, oxygen sensor, speed sensor) leads (under the hood now) under the RH side of the vehicle. 1UZ/2UZ SWAP PARTS AND UPGRADES! | North West Toys, LLC We offer several wiring harness options. A stand a lone harness, a piggyback harness, a full vehicle replacement harness! We offer OBD1, OBD2, and VVT options. These are custom built to your year of rig and the year of engine.