When I have the car in accessory, the temp gauge will stay where its last reading was from the sender unit n the block, but then when I turn to radio on, it goes up. As I turn up the volume on the radio it will also go up. Then, when I turn the radio up all the way, it will go past 260 on the gauge, haha funny right?

Its not really a problem, just why is it doing that all of a sudden?