There is the 1G ECU pinout above.
The #4 pin on the far right plug is the Oxygen Sensor wire. Tap into that and then you just have to find a power and ground. You can use either pins 101 or 106 for a ground. Power I will leave up to you because there are numerous places you can get power from. I can't remember the best one or the one I used but I am sure somone will.
Hope this helps.
CRAIG