As mentioned above, you can wire a switch to connect the reversion input on the display to ground which will force it to show all primary data all the time (PFD and EIS).
Alternately, you can setup the MFD to show a PFD window. To do this, on the MFD, select Menu, Menu, Setup, Display.
On a GDU 470, set Full PFD/MFD Toggle to "Enabled"
On a GDU 460, set MFD Split Screen Page to "PFD"
To show the PFD on the GDU 470, press the PFD button on the top corner of the display.
To show the PFD on the GDU 460, press the SPLIT button on the top corner of the display
Thanks,
Levi