ProTech Auto Systems is your trustworthy supplier of all ECM, PCM, and ECU Cummins Diesel; DC; DR; RAM 3500 Cab Chassis; RAM 3rd Gen Auto Computers. These devices monitor the fuel, air, and electrical aspects of a Cummins Diesel; DC; DR; RAM 3500 Cab Chassis; RAM 3rd Gen engine to ensure optimal engine performance. When an auto computer becomes impaired, that is where ProTech Auto Systems steps in.