The radio does not have to be built out of the dashboard for this
First remove the chrome faceplate.
Remove the plastic dial with a small screwdriver

Turn the white needle fully to the left

Point to lever with a small screwdriver

Move it to the right so that you can move it around the back of the needle

And here is the bulb

The bulb is spring loaded. to remove it just push in and turn a little to the left, for install a new one, push in and turn to the right.
First remove the chrome faceplate.
Remove the plastic dial with a small screwdriver

Turn the white needle fully to the left

Point to lever with a small screwdriver

Move it to the right so that you can move it around the back of the needle

And here is the bulb

The bulb is spring loaded. to remove it just push in and turn a little to the left, for install a new one, push in and turn to the right.