Keeping you Ready for the Road Ahead , the Dorman Automatic Transmission Oil Pressure Switch Manifold (PSM) is engineered to monitor hydraulic fluid pressure levels and shares this information with the Engine Control Unit (ECU). This data then permits the ECU to adjust for optimal engine and transmission performance, such as appropriate times to shift gears. If the pressure falls too low, it can cause excessive wear and potential parts failure. Avoid such headaches with the Dorman Automatic Transmission Oil Pressure Switch Manifold. Dorman has a distinguished reputation in the heavy duty truck and trailer aftermarket, manufacturing a variety of parts for a complete repair. Through advanced engineering, Dorman successfully checks into today’s most common failures to figure out the why, ultimately delivering modern solutions that not only match OEM parts, but solve known issues. FleetPride is your First Click in Heavy Duty .