Weird, all the early 90s Fords I've looked at on there all show a 3 pin triangular plug which 2 terminals are bridged and then the LED put between 2 of the terminals, can't see anything for a 2 pin plug :s I know they had a 2 pin plug as the original Ford diagnostic tool FDS2000 used the 2 pin 'serial link' connector on early Zetecs etc.