heres my story i have a 1988 4.5 liter cadillac eldorado
last nite i was riding and i floored the car from a start soon after maybe 25 seconds the cars coolant temp light went off i said okay ill just go home and check it out about 5 minutes later right before i got home the stop engine/temp light thing came on and my chime started to chime like the door was open or somthing so i got it home and the next day i looked at it and it was empty of coolant

so i was like hopefully no damage was done i found a leak and fixed it and started the engine now it doesnt feel hot physically when i look at the motor but the coolant temp gauge on the computer thing says 230, 240, 250 and keeps rising shut it off at around 257 but like i said it doesnt really feel hot at all it feels like any other car its not really hot feeling or nothing could this be a temp gauge sensor not working properly or something
please help it will be greatly appreciated