My temperature dash display is anything but accurate. It seems to have a mind of its own. Last week I drove 1/2 hour to work and it read 72 degrees the entire time. It was about 85 out. Today on the way home it started out saying 108 and increased to 113. It was 105 out. Sometimes it seems to stick saying the same temperature for an hour when I know the temperature is climbing or falling considerably. I have a calibrated very accurate thermometer for comparison to outside temp.