Natural Gas Engines are available in certified and self-certified models and can be built to meet your specs and applications. Most engines are available with the following options radiator, surge tanks, oil and temperature sight and shutdown gauges, tach’s and hour meters, drive plates and clutches, water pressure engine RPM controls. Orthman is a dealer for Cummins, Ford, GM, Origin, PSI and PSI/NG ranging from 30 HP to 420 HP. Let us match your operation up with the right product. Contact us for complete details, options, recommendations and pricing.