evoniners

I just purchased the prosport wideband o2 gauge/sensor kit for my Evo 9. I have three wires coming from the UEGO controller that in the instructions say are engine ground(black), 0-5v analog output(brown), and 0-1v analog output(green) What I have read so far is that the brown wire is installed in place of the rear 02 sensor signal wire on the ECU. So what about the green wire, where does it go?