New design electronics provide high reliability and long life with zero current draw except for the short periods required for level checking. Hookup consists of simply connecting 12 VDC power and the two-wire senders. Senders are simple, solidly constructed units with no moving parts, thus no floats to stick. ORDER BELOW Senders available for either threaded or flanged top-of-tank installation. Choose either 1-tank or 2-tank monitor with appropriate threaded or flanged senders.