My mirror has a temp compass reading the only thing on temp is OC I can't find anything to help on youtube. Does anybody know if there is anything I can do to get a temp reading?

You will have to replace the temp sensor,for this,and hate to say this ,but it is only a dealer item,you can try to dissconnect,battery cable for a few minute,s and see if it will reset,if it dosen,t,then replace sensor.

Yes he's right it is the temp sensor, But there's good news, you can pick it up from the dealer for about $13.00...easy to install, it's right by the radiator,buy it and replace it your self, it's called a EXTERNAL TEMPERATURE SENSOR and save some$$$$$$ hope this helps

Will it display OC if the censer is unplugged

Yes. OC stands for "Open Circuit"