84 Tbird temp gauge Reply #15 – September 23, 2018, 06:50:17 PM The Speedo is digital on the 85-88 years, mechanical on the 83-84 years (with digital being an option)And you can order gears just like you can with a mustang. Pop out the speed sensor(or Speedo cable) pop off the old gear and install a new one. Its really not that hard or expensive if it bugs ya that much. Quote Selected