flashing s

I am having the same problem with the flashing s and the speed always being at zero and my car even got stuck in 2nd gear, but now is shifting fine again but still the flashing light. I also have a 91 honda accord ex.
If anyone could email me the information about getting this fixed and cheaper my address is [email protected]

for the 91 accord its the speedo sensor. i think. i had that problem but never had funnie shifts.