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I installed an O2 sim that I made using some circuit diagrams on the web on my G20. Work great (almost a year now).
I just wanted to throw out the suggestion that you install the Sim inside the cabin, right next to the ECU. This way saves you're engine bay harness from prying eyes, makes for a 'cleaner' install and keeps the Sim out of the elements. I know some of those Ebay sims don't look any better than the circuit I soldered up, and may not hold up under the various temps/ water, found in the engine bay.
All you need is the ECU pinouts from the FSM, and splice in your signal wires from there... Just an idea.
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