90 corvette dash problem

I have a 90 vette w/ the digital dash. When it is cold the digital part of the dash doesn't work. It lights up but does'nt display. After the car warms up the dash will start working and will keep working as long as the car is warm. Anyone have or heard of this and know how to fix it?

I have an 84 vette with quite similar problems. My dash lights up during the day but goes black when night falls. The 4 light-bulbs in front of the dash light-up ok. I was given an estimate of $400.00 to fix it. Is there a way for me to fix it. Maybe a transistor, capacitor, etc., change?