I did this to mine recently and its not working right.
I have the generation 2.
Does the positive for the board have to be 3.3V or 5?
When I log it and turn the wideband on it reads correctly for a few seconds then freezes or drops to 10AFR.
My gauge keeps reading correctly. When I test it with my DVM on the board it will read near 2.35 volts for a bit then drop to almost nothing.