First off, I got this thing for free and yes I know they're shit compared to wideband (autometer $60 A/F gauge). I want to at least hook it up the best way so that it gives a decent reading. The other thing I'm worried about it it changing the voltage and thus effecting the way the ECU controls the A/F ratio. So I have a few ?'s 1. Which o2 would be best to tap into? 2. Will tapping either o2 effect the ECU readings at all? 3. Would getting a 3rd o2 be better/safer? If so would one of those Bosch o2 be workable? I would rather not have to drill/weld/wire a 3rd narrow band but if neccissary I guess I'll do it. Thanks!