I have a KUS SSS Water level sensor for my RV that I would like to have trigger a NO 12v solenoid valve to turn off when my tank has reached full (and ideally also sound a little piezo). The sensor ranges from 240 ohmΩ empty to 33omh33 Ω full. I'd like to trigger at about 50 omhΩ. I'm wondering what would be the simple circuit to make this happen?