installing ign. switch
Should go right into that connector. Here's a shot out of the '72 manual, which you can download from this thread:
http://www.forabodiesonly.com/mopar/showthread.php?t=132309&highlight=manual,+download
the second from the top of the plug, "12BK", and 5th from the top, "12R" should be what you need
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