Fox body ecu harness problems

ljn621

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Hi everyone, I am swapping a 4 to a v8 and ran into a problem with the ecm harness, my car is a 89, and the harness I got is an 89(at least the guy says) there is a 3r plug on the harness right by the ecm inside the car and I am wonder what it is, the plug is not on my car, I found a picture on the google lol and it shows that a 91 harness has this, can anyone explain what this is, thanks.
 

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Noobz347

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That’s was I was thinking, is there any other way I can tell that this is an 91 harness

Someone is possession of a diagram or a specific recollection will probably come along and confirm or deny.

Maybe: @jrichker or @TOOLOW91 ?

Mine are neatly hidden in storage containers awaiting a house to be built.
 
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