This information is well documentated in in the email users get when they order the Oi4FS add-on driver PMDG737 for MSFS.
But, as many do not bother to read documentation, I have listed the important info here as well.
After running the OiPMDG737 Setup file and installing the driver files to the Oi4FS directory,
YOU MUST DO THE FOLLOWING:
Make a configuration file for the PMDG737 airplane driver in Oi4FS's CONFIGURE page
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
If you do not have any Opencockpits FMC modules you delete the last 2 lines and set only the first line.
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