To have the PMDG 737 airplanes in MSFS to send out variable data outputs the following SDK lines in the 737_Options.ini files must be set for
all 737 variants( 600, 700, 800, 900)
[SDK]
EnableDataBroadcast=1
EnableCDUBroadcast.0=1
EnableCDUBroadcast.1=1
The path to the 737_Options.ini files are ( replace roa-k with your user name)
Valid for the 600:
C:\Users\{username}\AppData\Local\Packages\Microsoft.Flight Simulator_8wekyb3d8bbwe\LocalState\Packages\PMDG-aircraft-736\work
If you have the Steam version of MSFS,
C:\Users\{username}\AppData\Roaming\Microsoft Flight Simulator\Packages\PMDG-aircraft-736\work
Valid for the 700:
C:\Users\{username}\AppData\Local\Packages\Microsoft.Flight Simulator_8wekyb3d8bbwe\LocalState\Packages\PMDG-aircraft-737\work
If you have the Steam version of MSFS,
C:\Users\{username}\AppData\Roaming\Microsoft Flight Simulator\Packages\PMDG-aircraft-737\work
Valid for the 800:
C:\Users\{username}\AppData\Local\Packages\Microsoft.Flight Simulator_8wekyb3d8bbwe\LocalState\Packages\PMDG-aircraft-738\work
If you have the Steam version of MSFS,
C:\Users\{username}\AppData\Roaming\Microsoft Flight Simulator\Packages\PMDG-aircraft-738\work
Valid for the 900:
C:\Users\{username}\AppData\Local\Packages\Microsoft.Flight Simulator_8wekyb3d8bbwe\LocalState\Packages\PMDG-aircraft-739\work
If you have the Steam version of MSFS,
C:\Users\{username}\AppData\Roaming\Microsoft Flight Simulator\Packages\PMDG-aircraft-739\work