The Ford PTO (Power Take-Off) is a specific add-on for older Ford Trucks that allows you to manually adjust the idle warm-up speed. These are typically an add-on that comes with a wiring kit that would have to be installed.
If you're still having issues with the LCD giving you errors or the control readout is still not displaying correctly, please refer to the official troubleshooting guide for the PTO. In it, you'll find how to navigate the menus, along with a wiring pinout.
https://www.dropbox.com/scl/fi/lb4z490xbs5e42kxtkqo0/Ford-PTO-Auxiliary-Idle-Control-Module.pdf?rlkey=zb5jpsmbhsae8bu13uc4ndujw&dl=0