Ok I have torque pro so with your car running and torque active you can scroll thru all the sensors that are active,you will see o2 sensor bank 1 sensor 1 and o2 sensor bank 2 sensor2 ,I am using the readings from the sensor downstream which are sensor 2 on both banks or left/right side of engine.I added a gauge to my torque display that read the o2 sensor with a range from .1 volts to .9 you can change that also but theres a conversion chart that converts this voltage to a a/f ratio and I know .9 is something like 14:1 and .7 is something like 12:3 which is where I was,hope this helps or someone with more knowledge chime in.