The wire from the left side O2 sensor connector to the PCM is RED/BLK
The wire from the right side O2 sensor connector to the PCM is GRY/LT BLU
I only connected to the left side; by cutting the wire cover to expose the wire, and then soldered on the A/F wire and then applied the red rtv silicone for insulation. The RED/BLK wire is in the wire bundle at the left side of the oil pan. Just find and follow the proper wire color 'after' the O2 sensor connectors. (don't connect to the O2 sensor wires)
If you also want to add a toggle switch you can run a wire from the left side Red/Blk wire and from the right side Gry/Lt Blu wire to a toggle switch and connect the A/F wire to the switch. Then you can switch between the left side and the right side O2 sensor. I only connected to the left and didn't do the right side or switch yet.