The difference is that the 1986.5-1988 Supras have the yellow plugs and the 1989-1992 Supras have gray plugs. If you have the 1986.5-1988 Style, then I would just switch the engine wiring harness and ecu from a 89-92 Supra that has gray plugs. Hope this helps.
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1987 Toyota Supra Turbo-burgundy exterior w/gray interior+1987 Toyota Supra(N/A) light brown top,dark brown bottom w/light brown interior.
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