e28 plugs are not the same ;) they physically are different. also early 318 plugs have less wires, they don't have the oil level sensor wires at all.
M10 to M20 Swap + Wiring Guide
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Mtech1 v8 build thread - https://www.r3vlimited.com/board/sho...d.php?t=413205
OEM v8 manual chip or dme - https://www.r3vlimited.com/board/sho....php?p=4938827 -
Damn, this is exactly what I've been looking for over at bfc. I bought the engine side of a 318i and the harness side of an '86 eta. But I'm installing an '89 i motor. I guess I'll have to make sure the eta plug matches the i plug. I'm taking them into work tonight and splicing them up.Comment
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Does anybody know if there is an adapter you can buy somewhere for this? Or do you basically have to make your own?Comment

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