if the radio still works but you can't see it the display or it is not lighting up, then it is just a bulb that you can replace, but when i did mine, it was more than the bulb. i ended up running a hot and ground wire from the bulb to the back of the radio to an acc wire to get it to still light up. works, but just looks messed up if you pull the radio out.
with the hud, it is the sensor on it that prolly needs to be resolder to give it a better connection. mine does that sometime too to where you can't hardly see it when it is really bright outside, but i am not going to worry about it! do a search on this, maybe i have a link somewhere, hercman prolly does on his page.
http://users.adelphia.net/~bpaskevich/
http://tacgp.clubgp.com/custom_mods/index.html
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charlie
black 98 gtp sedan, 222,000 and running great with the new used tranny!
zzp 3" d/p aluminized
dhp 1.0