Hi kevinh,
Check out this page for setting up the Telem 2 portr for osd ( MAV_2_MODE = 3)
https://docs.px4.io/v1.9.0/en/peripherals/mavlink_peripherals.html
I’ve had my minimOSD running both of these OSD frimwares. You’ll need a FTDI to flash them but the instructions are reasonably clear. Look on Youtube for setup videos “MWOSD PX4 setup”
MWOSD
http://www.mwosd.com/
I don’t think you have to pay to use the GUI config tool (https://www.virtualpilot.co.uk/index.php?route=product/product&path=62&product_id=53) but for a couple of $ I thought it was worth it.
Minimosd-extra
Hope this helps.