1.1.98 Onwards Dual Chanel WBO2 Calibration ?

[Sprocket]

Both wideband chanels now function from 1.1.98 onwards. But how do you calibrate the second WBO2 sensor and how do you display the free air O2 gauge to ensure it is infact working??............

for those interested, before wiring second WBO2 ensure no other functions share the EC18 pinouts, as is normally the case, they are used for other inputs. Check schematic and actual build of your box before hand. Also ensure R103 75k is soldered