Turbo Timer and an SR20

[XAlliedYouthX]

So I picked up a A'pexi turbo timer from a member on here and obviously I'll want to get it hooked up in my S13 soon. What is the deal with the O2 hook up? From everywhere I've looked they say that it won't actually do anything but as far as I can tell there is nothing in the documentation that says it won't work correctly. I know it's only a narrowband signal and won't be of much use but I'd rather have this hooked up 100% then not put that wire to use if possible.