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They are plug and play as far as I know. The only "difference" I'm aware of is that the base idle adjustment for the '86 will be 800rpm vs. 880 for the '89. The upshot is that when you install the '86 in your '89 it may idle funny until you adjust the idle.
-Chris
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'80 911 Nogaro blue Phoenix!
'07 BMW 328i 245K miles!
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