Thunderbird L4-140 2.3L SOHC Turbo (1984)
Speedometer Module: Description and Operation
English/Metric Mode Selection Operation
The speedometer can display in either miles per hour (mph) or kilometers (Km/H). The mode is selected with the E/M (English/Metric) switch on the
upper right side of the instrument cluster. The display mode is changed each time the switch is depressed. The switch is positive acting, meaning that the
last selected mode will be maintained with the ignition switch in any position.