Multiple issues

Ever since I installed a sound system in the car (nothing over the top) the following 3 things have happening. 1 my thermastat guage shows my temp higher than usual. For example when the car has cooled down over night and turn on car immediately the guage goes up a bit as if saying the car is still warm and when it reaches normal temp it is over the half mark showing that it is running hotter. 2 my fuel guage shows me at 62 miles left to E and it still shows me at more than a quarter tank left. 3rd just started recently my driver door ajar prompt comes up on my dash and I hear a clicking noise on the dashboard. I have tried to clean the switch on the door but so far no change. Any suggestions on these issues would be helpful.