The ADC counts are in the ±32768 range; once you set your ±voltage range, the conversion factor is (voltage range)/32768.
For the peak-to-peak measurement, inside the "Signal Processing"/"Wfm measure" palette there is a VI called "Amp & Level" that calculates peak-to-peak and other values.
Hope it helps you!
Politecnico di Milano
Department of Energy, Nuclear Engineering Division