I also had an issue when I connected the at-300 dual band to the pv3. The at-300 has a keyed power and ground wire. The pv3 also sends power and ground to the at-300. It was back feeding the machine, and when the pv3 was plugged in, the dash on the machine would stay on. Dynojet wasn't any help. They only told me the at-300 wasn't compatible with the talon. The only reason I knew the pv3 was sending juice to the at-300, was when I extended the cable, I saw a red and black wire in there and tested the wires for power. I ended up disconnecting the black and red wire in the data cable, and it fixed my issue. If you do the opposite, the pv3 doesn't send enough power to trigger both o2 sensors.
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