I have 73 and earlier, and a 76. About all they "say" is to plug in special tester Chrysler part no blishy bloshy. (Actually it's C-4166-A or C-4166 and C-4166-1)
Here a some rough pictures of the procedures from the 75 manual on how to test it without using their special tester. Shoot me a message and ill get a lot better quality pictures for you.