I drive a 1990 new Yorker and I am trying to get a diagnostics software on my computer but I need to find the obd connection but I cant. I know I have to get a converter to make it an obd2 but the owners manual says it has a 12 point connection but I cant find an unused 12 point connection only a 5 point and a 6 point. any help would be appreciated.

 

It should be slightly under your dash and covered by a moveable panel...