The Pico GFX Pack and Pico Omnibus mouint on the Raspberry Pi Pico pins. there is no access to the GPIO pins once the pico is mounted on the display board. How can I access these pins when using the graphics boards?
If you have the Display mounted on Deck 1 of the Omnibus, you can access the pins via Deck 2. Just connect to the male pins on Deck 2. As a bonus they are all labeled for you.
Another option is to put this in between the Pico and Pack.
Pico Proto PCB
Will the Omnibus work with the pico W?
Will there be a conflict between the display and the ADC or other GPIO of the pico?
The Omnibus will work with a Pico W. The Pico W has the same GPIO Pinout as the Pico. I have used my omnibus with a Pico, Pico W, and Pico 2.
Raspberry Pi Pico W GPIO Pinout
The schematic will show you what pins the GFX Pack uses on the Pico. With that you can get an idea of what will work OK on Deck 2
GFX_pack.sch