Somehow I’ve missed that all along. Thanks. Already have the Cerbo, just ordered the sensor.
To be clear, you will also need the GX tank 140, the Cherbo itself only reads resistive and mA gages directly, not voltage gages. The 140 is a nice little unit though, a collection of I/O including the tank inputs. I've found a few other uses for it like bilge pump warnings and temperature inputs. There are a few relay outputs as well. Make sure you update your Cherbo OS, the earlier software will not recognize the GX 140.
The Tankedge gage will read a bit more accurately if supplied with a regulated power supply (the GX tank supply output cannot be used for this as it is a 24V output). TankEdge sells a little regulator you can use, or almost anything else works if you are handy.