93 Dtc 28

I am getting a DTC 28 on my 93 camaro. I saw some place where it ment Transmission Range (TR) pressure switch assembly fault. I posted in the drivetrain forum and was told that it might not be the tranny code since it was a 93. I just want to figure out what is wrong with my car. So anyone know what this code is on my 93.

Thank You

Taylor