Check Guage Light blinks

My temp on my car goes up right away from the min i start my jeep up but its not over heating like it says it is wat could this be?

Does it go all the way to HOT? More info please. It could be a bad sending unit or gauge. Wire maybe disconnected or grounded.

Make sure the temperature sensor is giving the right resistance, check for the terminal is doing good contact . check the cooling system also