Quote Originally Posted by FordMan77 View Post
Do you have the owners manual? Would think it would be in there.
I have every Manual known for these cars. But, I found it. It is listed in the wiring diagram for the CJ2.

There is a 1 wire connector, in the harness to the CJ2 that is broken out away from the main connector. It is about 12" behind the main CJ2 connector. If it is connected, it will read metric. If it is disconnected, it reads imperal.

All it does is either ground or un-ground that specific wire for switching the unit.