I would just leave it. A lot of work to just change to a speedo that is in mph and climate control that reads in degrees F. As far as I know it is illegal to use a different instrument cluster because it would not match the mileage of the car and such.
Not sure what to do about the instrument cluster, but for the climate control, pop off the bezel that surrounds it, and pull it out. There should be a little plug either plugged in or unplugged...do the opposite.
I forgot if its plugged in if its F or C. But if yours is plugged in, unplug it, and vise versa.
If ya need one LMK
Speedo is in KPH but odometer is in MPH? how does this work?
Speedo is in KPH but odometer is in MPH? how does this work?