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you have to remove the black pieces around the steering cloumn. it's two screws that hold it in. they pop off and all the wires are right there. hector supplies the t clips and everything, and tells you which wires to tap into. it's very easy, the longest part is getting at the wires!
I have an Apexi and it works great!! i usaully set it for 1 min (manually) for local drives and 3.5 min when i come out of the Autobahn... Though it does come with the auto-timer. But im not sure which wire is the O2 sensor since it has an Upper & Downstream set
you can't use the o2 sensor wire with the apexi, the volage is different in our cars. that's part of why many people don't use the apexi, most of the features don't work on our cars.