It sounds like your oil pressure sensor, showing incorrect readings. HIgh oil pressure is ok, but too high can cause some problems. You could also try to replace your pcv valve incase it is stuck closed. Here are instructiosn on testing the oil pressure sending unit. Let me know if you have any other questions.
1. At the oil sending unit verify the Black wire is a good ground and the Gray wire has a 5 volts reference voltage. 2. Then backprobe the White wire and look for a change in voltage. The voltage should change with oil pressure and engine RPMs on the White wire. If the voltage is always high or always low then suspect a faulty oil pressure sending unit.
3. If the voltage is correct then check the powers and grounds at the unified meter control unit.