Can ACARS be displayed on the PMDG CDU?
Software such as the PMDG series does not allow third party additions to interface. I am not aware of any way to make anything appear on the PMDG CDU. This means that you cannot use the PMDG CDU to display my ACARS interface. You have to use my own MCDU, which is designed to play along with most other software out there.
The opposite is true, by the way: nearly all software out there can be adapted to display on my MCDU. It takes work, but everything is open and well-documented.