My girlfriend has a 1990 Accord LX Automatic, theres a S light on the lower right of the dash. It flashes after driving it about 2 minutes. Thespeedometer is not working, my ? is what is the S light. I think its a transmission code but not sure. Im thinkin it needs a speedsensor since the speedometer isnt workin. But i have not looked it to it yet. What all should i check for the speedometer? thanks guys.