That suggests it's not a bulb fault, but something further upstream that affects all. I've a Haynes manual – so that's better than nothing – and although anything electrical is bamboozling to me, I can see that the things that don't light up all run off one section of the diagram. I've no idea if that's just a diagramatic representation or if it actually is one unit, say a fusebox or something. Whoever compiled the diagram didn't trouble themselves to identify it.
Unfortunately, the temp gauge and fuel gauge are in that section as well but both work fine, whereas the radio illumination that doesn't work is in a different section altogether. However, I do know that auto electrical diagrams for what seems to be your car aren't necessarily completely accurate – the manufacturer often makes changes to the way it wires things even in the same model range.
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