ECG Performance Electronics O2 SIM/MIL Eliminator

so do you have to take off the 2nd o2 completely or just take it off, solder the resistor on the blue wire and replug it back in?
 
So I actually still have one of these.

I installed it back in the day, but I had wired it incorrectly and it caused issues. Anyone have an old wiring diagram for this?
 
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