I can't speak immediately to the problems with the tach or the rich condition that you are speaking of, but the pinging is something almost all 94/95 owners are familiar with.
Our model cars are notorious for pinging (mine got the name pingmobile a while back) and about the only thing I have found that can "fix" that is to drop your timing down low. When I had stock heads I had mine down to around 10 because of the pinging. I tried high octane (which sort of helps), octane adders, new radiator, fan, etc and none of them worked. Lowering the timing helps a lot.
Once I went to aluminum heads though all the pinging went away. Good luck, and I'll think on the other issues you have listed.
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