The 84 to 88 will work. The 87 - 88 have a 880 rpm idle while the others have a 800 rpm idle. I am running a 28 pin Motronic in my 84. 28 pins were the 87-88 version. I believe the 83's did not use a Motronic. http://www.programainc.com/doc/Porsche.html is a link to what DME fits what year Porsche.
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DonMo
1984 911 Carrera Targa
3.2 liter, SSI's, Dansk 2 to 1, Steve Wong Chip
Columbia, SC
"Go Hokies"
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