There is a 16 AG that live a mile from me. My son sent pics from the drag strip of it while I was waiting for my 17 AG to be delivered. Just messing with him I asked if they live in Shepherd, he said yes. Then I said I bet they live in arrow island and he said yes again. Who knew.
Remember that the PCM uses 5vdc for signals, 12vdc will be bad. And inside the 5 volts is a good and bad range, 0-.5 is bad, .5-4.5 is good and 4.5-5 is bad. That's the way the PCM determines what is a good or bad voltage range.
Picked up my Avalanche Grey GT350 a week ago Saturday in Salt Lake City. I can say it is completely different than my 95GT I had. Tidbit got 24MPG doing 65-90 MPH.