Help no dash lights

[new2birds]

Hello, I have a 85 bird with the digital dash. The lights for the speedo and tach have went out. I replaced the bulbs for all 9 side lights as well as the larger 3 on the bottom. Does any one know of a fix for my prob? I can see every thing still works, tach, guages and speedo. They are just not lit up. This is a great site with a lot of great info.
Thanks