Really enjoying the process of figuring out how to use the AFS 3500 and AFS 3400 on our "new" Sportsman. Serial number of the 3500 is 60156.

Quick question -- and apologies if it's moronic:

As I was checking on the setup of the boxes, I noticed that the "Instrument Calibration" page on the 3500 has items 9 through 25 "grayed out," while the same page on the 3400 has only items 2, 3, and 4 "grayed out."

Why is this? And if I change, say, the "Horsepower" setting (item 22) on the 3400, will these numbers then prevail on both boxes?

Thanks for any assistance,
Doug