Another Wiring Harness Question.

suprflyusmc1

New Member
Dec 13, 2006
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Ramona
Ok so since i bought a 1989 wiring harness that's yellow plug. What do I have to do with my 1990 car to make the 1989 yellow plug harness work with the setup I currently have? Can I buy a 1989 ecu and make it work that way?