Capacitive level measurement (not soil)

Hi there,

today I had a small emergency, my water cistern did overflow, what basically leads to a flooded basement. Its an issue of a missing pipe for the sewer connection, I could add that, but it would be a major construction with a big excavator under my terrace. I therefore plan to do it when I have to dig up that part of my back yard anyway for my pool and conversion of the terrace to a conservatory where I will need to access the exact same sewer pipe anyway for the pool and to move the gutter down pipe.

So I have a pump for my irrigation system, that is fed from that cistern. This pump comes with a capacitive level measurement system. But well, the display is in the basement. Not conveniently on HA.

So my question is, how do I get such a capacitive system to feed to 2 display units? One the pump, that has a switch over to city water if the level is below a set point and needs that input, and two to HA to have a nice visualization, what I want to have since quite some time now? (and for now, to activate the irrigation valves to drop the cistern level if a spill is likely because its at >95% and its raining, better to irrigate while its raining than to clean up the basement due to self-inflicted flooding)

The search did not turn up anything regarding capacitive level measurements aside from the soil probes for measuring the moisture in the ground.

I found quite some level sensor with IR and pressure and what not Harakiri solutions. All way less reliable compared to an easy 2 wire capacitive system that is totally immune to temperature, atmospheric pressure, dirt, contamination, water and moisture, as its only a simple cable, and the evaluation unit is far far away from the tank. Also there is no requirement to have grid value at the water tank, that on itself is a big thing since we all know how mixing water with grid voltage tends to end.

So what am I missing?

Thanks
Manne