Electronic Design. Wet Sensor modification design

Hi We use a float switch to detect water in a flow cell, I want to get away from moving parts as the float sticks sometimes and causes leaks. I have seen these [login to view URL] and [login to view URL] [login to view URL] This last one I know works. We have fitted 2 of them, one to detect empty and one for full. The problem is they are too big, I want this idea, but no need for level detection just empty full and must connect to 4 pins (2 each) or a better idea. To avoid any firmware changes, add them to the pins on our board. This is what we are using at the moment [login to view URL] nternational/vcs-04/float-switch-vert/dp/1006796 I have attached more images The idea should be very simple, a version of this https://www.amazon.com/gp/product/B071F4RDHY/ref=as_li_ss_tl?ie=UTF8&linkCode=sl1&tag=piddlerinther-20&linkId=77f1c0f9c67c51d76b687628afa62ce1&language=en_US we can buy the potentiometers from them, the probes will be in salty water, close circuit when in water no circuit when out of water. So it is basically 2 of these one to detect empty and one to detect full, but in one board.