From the 30-2301 instructions:
Make sure to verify that the O2 #1(#2) Gain (option) is set so the voltage from the O2 #1(#2) Volts (parameter) matches the voltage input at the EMS from the O2 sensor. An easy way to do this is to disconnect the UEGO sensor from the UEGO controller. When in this state, the UEGO controller will output 4.00 volts. You can then adjust the O2 #1 Gain (or O2 #2 Gain) until the O2 #1 Volts (or O2 #2 Volts) display in AEMPro reads 4.00 volts.