HondaCivicForum.com - Dont Know What To Do

I have seen quite a few posts on here about how the speedometers in these cars like to mess up and read wrong...I have had the same problem in which mine always read 5 mph too fast. I went to the salvage yard yesterday and got another instrument cluster, plus the dash clocl because mine never worked since I have had the car. My speedometer still reads around 5 mph too fast, but yet the tach and all other controls (fuel & temp) seem way more accurate now than with the old cluster. What do you guys think I should do...buy a speed sensor for it or call the dealer? The car is a '93 EX with 241,000 miles on it and has brand new tires with factory specs. As to the clock, Mine had this little burnt spot right on the right lower corner, like something had burnt out of it, and all the clocks I pulled from the other Civics in the yard were in the same condition. Is this something known to happen? Do I need to go to the dealer to buy a new clock? Thanks for any help you guys can provide...I do not know what to do about these 2 issues.

P.S. In my old cluster, I tried to move the speedometer hand to where it should have read while moving down the road and I couldnt get the hand to adjust to where I needed it to be....everytime I would let it go it would go back to reading 5 mph too fast.