In a 1990 auto legend their is a gear selection known as S3/S4. Its like a sport mode or something. anyway, when I put my car into drive and go over 35mph this S3/S4 starts to flash on and off in my instrument gauge. I think this would indecate trannie problems but I can't be sure. What does this flashing light mean?

Cars & Trucks - Acura - Legend - 1990 Acura Legend