1995 Toyota Tercel larger sized tires.

I just bought a Toyota Tercel. Driving from the dealer, I noticed that the speedometer was reading that the car was going slower than it actually was. I checked the tire size and the car has 14 inch tires. I believe the OEM size was 13 with a 14 option. I know on some vehicles there is a speedometer gear that one can change. Is that available on this particular car?