The GTN 750 is now available for some of the GA aircraft in MSFS 2020.
I bought the one from Garmin for FSX and it is amazing for navigation.
This one is amazing also, but you must read the installation instructions
and there is a few YouTube videos on the install. but must be done in the
correct order and how to shutdown FS2020 and restart.
Right now its in free BETA. add your accounts, add to cart and $0.00 shows in the cart.
https://pms50.com/msfs/