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You should also bone up on battery replacement for the OBC and service indicator board. It's a good thing to do while you have the gauges out. My cousin is pretty good with a soldering iron, so when we replaced those batteries (we made a little battery holder with long wires, so I can replace them myself next time with no soldering), I also had him re-flow the soldered joints on the back of the gauge cluster, which eliminated the problems I was having with my speedo not working.
Lots of these cars have speedo troubles: seldom do I hear about non-working tachometers. That's why I suspect your tach troubles are fuse-related.
Go find a buddy who is good with a soldering iron!
I started out with nearly all of the troubles you described. I'd fix stuff, and fix stuff, and nothing would improve. Finally, when I got replaced the OBC, EVERYTHING started working at once, and it was deeply, deeply satisfying. Hang in there.
Flunky
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