Mitsubishi 3000GT Service Manual page 1112

INTERIOR - Instrument Panel
REMOVAL SERVICE POINTS
Remove the screws and remove the column cover while being
careful not to break the claws.
Disengaging the clips of the center air outlet assembly with
a fiat tip (-) screwdriver, remove the center air outlet assembly
with the trim stick.
(MECHANICAL TYPE SPEEDOMETER) REMOVAL
(1) Disconnect the speedometer cable at the transaxle end
of the cable.
(2) Remove the adapter locks from the instrument panel.
(3) Pull the speedometer cable slightly toward the passenger
compartment and remove the adapter.