The LM500 maintains oil level on any size engine. It also supports installations that require a three-wire, snap-action switch. The form C (three wire) contact allows a controller/annuniator to be wired as a closed-loop system, resulting in a reliable fault-sensitive circuit. Refer to LM500 Series flow Rate Chart for application data. See attached link for more data https://catalog.baileymotorequip.com/item/f-w-murphy/level-maintainers/lm500-tf