See Level SeeLevel II (TM) LED Tank Monitor System for 4 Tanks 709-P3W - 1003 20-7079

Used to monitor battery voltage, fresh water tank, gray water tank, black water tank & LPG tank levels. The monitor panel is 2.8 inch wide x 4 inch height. Includes 3-way pump switch, LED display, sender strip & pigtail. Measures up to 3 holding tanks & 1 LP tank. A single two conductor wire is used to connect all the sender panels to the display.