2003 Dodge Intrepid temperature gauge

At 86,000 miles, absolutely, you should be concerned, have a good look at the level in the overflow resevoir. Only take the radiator cap off, if it is completely cold. It may, or may not be serious. But heat, unregulated, will destroy your engine and transaxle. I hope its just an electrical sensor or thermostat, but these engines are made to last about 60 or 70,000 miles, before needing some type of cylinder head gasket service. After a test, you'll be sure, and have a better picture of what you will need. Good luck, if you need help with any decisions or a place to have it tested, let me know. Ok