There are no symptoms of high engine oil pressure, unless you consider the reading on the oil pressure gauge a symptom. High oil pressure can be caused by using heavier weight oil than the vehicle manufacture suggests using. It can also be caused by a dirty oil filter, or other restrictions in the engine’s oil passages. Barring these types of issues, the most likely cause of a high oil pressure reading is a defective component within the oil pressure sensor/measurement system. Placing an external gauge into the port occupied by the sending unit will let you know if you have high oil pressure, or a defective component.
For more info, see How to Use an Oil Pressure Sensor