R.Roark5048

I have a 1988 f150 xlt 302 4x4 4speed with overdrive. The 02 sensor is unplugged and the o2 plug end is hanging there. I cannot find any wires coming down to attach the 02 sensor to. I have found a plug that isnt connected to anything right behind the engine and it looks to be a 3 wire. I was hoping somebody knew where all the connectors for the 02 sensor wiring is so i can make sure this is it.