How does one change the dash colors from green to red

hold down the odometer reset button mabe...

After researching the resources available to me, I did not find an answer to your question. I would suggest you call your dealership's service department and inquire about the problem you are having with your DIC display lighting. Most likely they will be able to answer and diagnose the issue. Vanessa, GM Customer Service

As far as I know the corvette didnt com from the factory with the ability to change the backlight options, you might want to try messing with your dimer switch to see if it does anything.