Thanks everyone for the advise. It doesnt seem to be the thermostat, and Im not really sure how i can check the ECU to evaluate which sensor it could be. Its really irritating though. I do have a diablo sport tuner, but I dont have the slightest clue how to use it to check anything... needless to say Im no car genius

To elaborate on the issue though, at first it would not register, Id turn the car off and then back on and it would rise to normal. the next day, same thing. Now it just doesnt rise at all. If it is one of the sensors, where would they be, and how would I go about checking them? Thanks everyone for your help on this