It seems this allows for any LCD, but I can only get it to display on the PB display.

I have LCDs on the same grid as Panel 3 and Panel 4. In the custom data of the PB I tried:
ShowStats
Panel 3
Battery, optional

I also tried putting it in the Custom Data of the LCD (as the documentation implies). I also ran 'powerup' and 'refresh', but I can't get the data to show on the LCD panel at all, on the PB display.

I feel like I'm missing something simple. I tried the subgrid limitation as well in the Custom Data.

LCD panels are set to display images and text.