I just tried to convert Engine Oil Pressure from Volts to PSI and the drop down box only lists "None". as a conversion. I changed 'Factor' (32.0000) and 'Offset' (-16.00), but can't put 'psi' in the 'Quick Select' box.
For Example, the 'Quick Select' box for temperature has 'F' or 'C'.
Looks like I fixed it by adding the conversion to the 'EFILive.ini' file.