[dcb]

Probably, I don't know what a LAF is, but the arduino can do an analogRead of 0 to 5 volts pretty trivially, so it is well suited to a wideband. It could possibly be tuned to give a meaningful reading on a narrow band too, though that is pretty speculative. It can read the narrowband sensor turning on and off, just making sense of it is the hard part if you are not the computer controlling the mixture to begin with.