Automatic or standard tranny?
Manual: 8-Tooth 3.73 Ratio / White 23 Speedo Gear
Automatic: 8-Tooth 3.73 Ratio / Black 23 Speedo Gear
Steeda's site has all of the info you'll need:
Speedometer Recalibration Gears - '79-'98
Manual Transmissions with 7 Tooth Drive Gear
- 1983-1989 T-5 OEM
- Pre 1993 T-5 Aftermarket
- 1996-1998 Cobra T-45 OEM
- All Tremec Transmissions
Manual Transmissions with 8 Tooth Drive Gear
- 1990-1995 T-5 OEM
- 1996-1998 T-45 OEM Except Cobra
Automatic Transmissions with 7 Tooth Drive Gear
- 1983-1989 Automatic Transmissions
Automatic Transmissions with 8 Tooth Drive Gear
- 1990-1998 Automatic Transmissions