I have a 1990 Honda Accord and yesterday I saw a flashing "s" under the temperature gauge. Then the speedometer stopped working (It started to work again, but then it quit), and my check engine light came on about 10 minutes later. The car's performance is still great, but I would like to know what the "S" means and why the check engine light came on and the speedometer stopped working. Are they related? Any answers?