Hello, I have the Ford 007- 00018 Rotunda EEC-IV computer Monitor. I am looking for the #26 computer overlay / programmer for this tester. I believe this is the correct overlay for my 1991 5.0 Mustang. All I really need is a photo of the overlay so I can modify the one I have. The overlays are part of the EFI/SFI Engines 89-91 Engine Diagnostic Manual. Thanks for any help.