97 sl500 flashing yellow light in speedometer
 

Greetings, does anyone have any ideas why my 97 sl500 yellow flashing light starts flashing at about 35mph. Here is what I have gathered so far. The car seems to drive fine most of the time, without the flashing light or any other issues. It seems at the end of a hot summer day, the car starts off fine, then when I get to about 35mph the yellow light starts flashing and there is some minor roughness and hesitation. As long as I keep the speed under 35 it doesn't flash and the car seems to drive fine. Then after a couple of miles, I can continue with the acceleration and everything seems fine and is there is no flashing yellow light. Thanks for any help you can offer.