The lights that illuminate my clock and my speedo are all out. Do I need to pull the dash to replace them or am I able to access the bulbs from under the dash?

 

What year and model?

 

1971 Cutlass Supreme

 

I doubt all the bulbs failed at the same time. I would start by checking the fuse labeled “4A INST LPS”. If that is good check if you have power on the grey wire that supplied voltage to the bulbs. If those are good it’s probably a ground issue. On 71 remove the gauge bezel and pull the pods out through the front no dash removal needed. The ground is supplied with metal ground straps on the dash the the gauge is mounted to.

 

When I bought the car two of them were already out. After 6 years the other speedo light went out. The only thing lit up now is the gage for the dummy lights. Idk if that helps or not.