As @Wandering_Nomads said there isn’t anything that reads the propane levels within the spyder system. I have done the same mentioned and have Mopeka sensors and used them on the last three rigs. With Mopeka you can see the levels from the app on your phone or buy the WiFi bridge and will give you a display to place in your rig and check the levels remotely. I have mine tied to my Cerbo and can monitor my levels remotely through VRM which is working nicely this week as I am a few thousand miles from the rig which is in freezing temps.
There isn’t a whole lot to configure with the codes for the spyder system outside of changing to a different unit or enabling some functions like when adding an additional AC. You do this by going into settings, holding “coach model” for 7 seconds and entering the code 1478.
I have another post in the group where I posted the login for spyder website which really just gives the pinout for the Spyder G6 and RS-9 (2016-2022 models) and G12 (2023 models).
If you have specific questions about the Spyder control systems you can contact Spyder and they have excellent customer service. All wiring questions would have to go through Tiffin.