[dazq]

Don't forget that although speedy does have the ability to read 2 O2 sensors only one has any influence on the fueling. The second channel can be viewed and logged .
You will need to add the second O2 input components on pretty much any board out there

Are you saying NO2C board needs extra components to use 2nd O2 sensor or other boards can but NO2C can never fuel using 2 x O2 inputs? Sorry I don't know much about these sensors but I just spent more on controllers and sensors than on the rest of the kit combined.

Speedy firmware only supports the first O2 input to modify the fuelling calculation. This is nothing to do with board selection is is a firmware thing .
The second O2 channel can be viewed and logged in TS only.
Almost all speedy board designs only have one O2 input as Std. To use second O2 you need to add the 3 or 4 components that the O2 input consists of . This circuit section can be seen on the schematics of the boards . The components are for protection and signal shaping.