I debated drilling the passenger side but I didnt have the money to invest in fiberglassing materials. I may still go that route and glass over the hole by the steering wheel. I have about 3 more gauges to install and I just dont like A-pillar pods.
its the black wire on the O2 side of the harness. But if you dont want to have to rewire everytime you change the O2, you tap into the corrosponding wire on the engine side of the harness. Which is white.