Wong is right, the WOT switch is not activating. I had checked it after my rebuild this spring and it was fine so I didn't check it before I headed to the Dyno. My bad

As far as the RPM question the operator of the Dynoo had me run the car up to 2500 RPM and hold it for about 10 seconds so I'm guessing he was calibrating the speed of the Dyno to the car? Not sure.

What if anything am I going to notice when the switch gets replaced?
I'll be ordering one from the host tonight.

The WOT switch is adjustable. Try using a hammer and blunt screwdriver and tapping on one of the mounting tabs or the other to get it to activate at the proper throttle position. With a properly operating WOT switch, expect a much flatter AFR curve, 6-8 ft-lbs more torque in the midrange, a smoother power curve and about 15-20 more hp at the top end.