I have an SCT XCal2 for my 2005. It says you can only tune your 2005 with it but you can read codes from other Fords with it. I was wondering if I can use it to read codes on my '91 and my friend's '86? Anyone know.

 

Nevermind looks like it's a totally different connection. Did get this from another site though and it looks helpful:
http://www.troublecodes.net/Ford/

 

1996-current is OBD II so I'm positive it won't work on anything older than 96