Frequency range actually goes to 11500 and if your PCM tables went higher than that the sensor is actually able to go up to ~15000 or so. (so scaling down the MAF reading with an AFC and then increasing the values in your MAF table to correct for the AFC would actually allow you to use the MAF at higher frequencies than 11500.)
I'll strongly caution against the AFC'*. They have a bad track record here.
I agree they aren't the most reliable thing, just letting him know that it is an option to scale the reading down if he needs to....probably dont' want to scale it TOO much though, not more than like 15% or so.
Well, it could switch between enhanced and standard mode randomly and lose the setting or the display could scramble like mine have. I know mine still works, because I increased the signal and my LTFT got closer to where it should be. But I don't know what setting it is at anymore. Trying enhanced mode would be impossible at this point.
I've heard wiring it so it'* in the cabin helps out with life expectancy.