OK, does the cig lighter work now that you've replaced that fuse? I'm talking about the first one Ddaddy pointed out.

If it doesn't you may have a connector or two behind the dash that has come loose.
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Ok so the cig lighter is working fine now.

But I still have no instrument lights.

I took the bottom part of the dash off and checked the connection to the dimmer switch and everything seems to be connected. I still have no instrument lights.
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Update - after trying everything i could think of i just installed a new cluster and now the backlighting works.

Thanks for everyone's help.