Welcome to AF munzy !!
Sounds to me like its leaking in behind the strut towers. A usual leak on these model GA's. Best way to get to that is from under the dash up on the fire wall.
The carpet and mat need pulled back to access these areas. Then just knock off the rust(dont pull any of the old sealer out!) and silcone it closed!
Your instrument cluster could just be going out, this to is a typical problem for this model. You can find used ones and rebuilt ones on fleabay.
