Bulbs are cheap and you can buy them at any auto parts store. You can also convert them to LED if you want. Will make the speedometer faces blue instead of green when they are lit up. The odometer gear is a common break and is a $20 kit on LRS/AM etc...
Pulling the cluster literally takes 5 minutes. Pop headlight knob off, remove screws from bezel, remove bezel, remove screws from cluster, pull cluster out, reach behind and undo the two wiring plugs. Installation is reverse of the removal. The bulbs are on the circuit board behind the black twist off caps.
2000 Mustang GT Steeda #0048
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.