You may need to swap some emissions stuff over (depending on your local laws and if you choose to follow them). As for the harness, I'm pretty sure that on the JDM Supras the ECU is going to be on the left side of the car, not the right like the USDM Supras. So you would want a US harness, some of the sensors, and then your ECU and engine should work fine. Or you could lengthen your JDM wiring harness.
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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