based on this diagram of the CAS on a 164 (I added the red dots pointing to the nubs on the plug, two one side, one on the other), where the pins are marked A / B / cover (cover must be the screen, or on our CAS, pin #3)
by elimination therefore, I would say pin #1 is the left in your photo
PERFECT -Thank You!!
1969 GTV 1750
San Diego, CA
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