hey guys i looked over the srt service manual but can't find wat i was looking for. i'm looking for the wiring diagram for the ecu. i need to install o2 simulators but don't want to tap right next to the o2 senor under the car near the exhuast. i wanted to tap into them under the hood. i looked thru the service manual but can only find the wire diagram for the 02 sensor itself. please help. also what is the difference when the say upstream and downstream for the 02 sensors. i need to tap into the rear o2 sensors between the 2 cats (or the ones closest to the muffler) thanks.