beretta manual? I have most if not all of the calibrations GM released for this whole lineup of PCMs, but there was never a manual 3100 anything released in the US.

with a .6 volt range, you would have roughly 30 a/d counts to work with. that would be pretty rough, considering that's a little worse than what a 5-bit A/D converter would produce.

if you really wanted to.... you could always lift the pin off of the board and setup your own filter/pulldown rather than attempt to hunt down the existing components. at this point, there isn't going to be a huge difference in the amount of work/risk required.