Y-TRY-
Our Wideband Air/Fuel gauge utilizes a Bosch LSU 4.2 sensor which we have coordinated directly with Bosch to develop a calibration specific and fine tuned to this sensor type. Minimally all Auto Meter branded gauges are designed to work within +/- 2% of the true reading, though instruments such as the wideband and full sweep electric stepper gauges tend to fall within tighter tolerances still.
Regarding the PCV or Wastegate issue, I'm not honestly sure how either of those would affect the sensor reading. I can tell you that the sensor needs to be placed post turbo due to potential back pressure related issues and that placing the sensor to close to the end of free flowing exhaust can result in reversion which will lead to inaccurate readings from the sensor.
Jody, regarding your situation, I'd want to know more about the sensor type used on the BS3, and where you have each sensor mounted in order to better address this question. An age difference on the sensors could also be a contributing factor.
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