Can you put your year and trim level in your signature?
Remove the coolant level sensor from the engine side (top) of the radiator. Clean the face. If that doesn't help, just disconnect it or replace it. It'* getting tired. This is assuming your coolant level is actually good. Coolant drain is on the DRIVER'* side, looking up from underneath through a small hole in the subframe, bottom of the rad.
The advice to check your 6x9'* is a good one. But it sounds like you may have a dash cluster problem. We'll see how it goes, but in the meantime:
How is your oil level on the dipstick? If it'* good, the LEVEL sensor (error on the DIC, right?) is in the oil pan. Actually pinched between the pan and block. Check the wires.