Does this actually happen to the tachometer?
4. A good example of how the gas pedal will respond is if you're parked on the side of the road in neutral and press the gas pedal to 3k rpm and click the dial up (+1) you'll instantly see the slingshot jump to 3,200 rpm, (+2) 3,400 rpm, etc.. These are examples of the logic.. not the actual results.
I'm sure it works like the pedalmax and amplifies the signal. At idle the signal is zero, zero times anything is zero, so no change regardless of setting.
If you hold the throttle in position and increase the setting it on the pedalmax it will increase the rpms. I can't speak directly to the pedal commander but I assume it works the same way.