The Model DPS-50 may be mounted in any position on a flat surface by two screws or bolts through the holes in the back of the case, or by use of the universal mounting bracket in an area protected from the weather. Locate switch where vibration, shock, and ambient temperature fluctuations are minimal. Be sure to connect the high-pressure source to the port labeled "HIGH" and the low-pressure source to the port labeled "LOW". To avoid damage to the control, always hold a wrench on the wrench flats of the pressure ports when tightening pressure connections. Never tighten the pressure connections by turning the control into the fitting.