[ebradway]

I think the Rennlist guys may be onto something. GRanted, it's not a very big sample, but if I've got the two-prong plug too it may be pretty safe to assume that 3.2l 86's have the two-prong plug while the Turbo 930 has the three-prong plug.

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Eric Bradway
'86 911 Targa
http://www.bradway.net/porsche