Autometer A/F gauge question

The O2 sensor output would be steady at 7 lights on my Shelby Daytona when it was cold and running in open loop. And, it would be steady a 9 lights when I was at WOT under acceleration (14 psi boost) again open loop. This was typical operation of the Shelby Dodge turbo vehicles.

Never had any experience with other vehicles and how they behave. FWIW, I have been told that the up stream O2 in my 03 Turbo PT Cruiser is a wide band sensor.