The high-pressure oil pressure on a 7.3 Powerstroke diesel engine can vary depending on the specific operating conditions and the age of the engine. However, a typical range for the high-pressure oil pressure is around 500 to 3,000 psi (pounds per square inch). It's important to note that these values are approximate and can vary based on factors such as engine load, temperature, and the condition of the engine's components. If you have specific concerns about the high-pressure oil pressure on your 7.3 Powerstroke engine, it's recommended to consult the vehicle's owner's manual or a qualified mechanic for more precise information.