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Well, I've done some research on proper placement of O2 sensors for WB applications. I came to a conclusion that it should be between 20-30 from the exhaust ports or for turbo set-ups, 20-30 inches from the turbine housing. According to a few manufacturers, that distance will be the most reliable and most acurate.
If you think about it, it makes sense. The farther it is in the pipe, the slower the exhaust flow, due to desipating heat. Heat travels from hot to cold. With the distance of 20-30 inches, the sensor is protected from too much heat which can cause the integrated heated element to fail. Also, the exhaust flow is more stable in that area for better reading. This scenario allows more of a representative of what your motor is doing. Too close to the turbine (exhaust port on N/A cars) may not reflect what all the cylinders are doing. Sensor being too far may delay the reading of what the cylinders are doing.
Another tip is not to touch the sensor itself. Moisture on your finger can mess up the readings. Lastly, position the sensor upright as much as possible. Expanding gas gathers floats.... this can give you more acurate readings on idle, which is when gas flow is scarce.
I hope that helped....
I have that AEM UEGO with gauge. I also have it tapped on my AEM EMS. That is basically what my primary O2 sensor is. The OEM O2 sensor is just there to plug the hole......
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