Looking for O2 sensor signal - stock ECU
 

I'm looking for the front O2 signal pin to wire in a UEGO to my stock ECU, but I can't seem to find it anywhere on that pinout sheet. I see the front and rear O2 heater control pins on 3J and 3P...is that the signal line? Or am I just missing something?

Thanks!

Front O2 signal is the blue wire at 4W:

https://www.miataturbo.net/attachmen...1&d=1426123352

Thanks Joe, that diagram is very helpful!