Instrument cluster (possible short)

The car would not start after it sat for four weeks. I jump started it. I noticed that the transmission gear did not display on the instrument cluster. The odometer reading also does not display but the trip distance does. It will not switch between trip distance and odometer. Two orange boxes show above where the transmission gear should display. They contain the numbers 1 and 2. The coolant temperature is reading 3/4 the way to hot now instead of 1/2. For a couple of days it was pegged at hot (even when the engine was off and cold). It has now returned to 3/4 the way to hot. The coolant level is full. The car starts and runs good for a day after I jump start it. After that, I have to jump it to get it to start. The alternator is supplying 14.5 volts.