Swap out the engines. Leave the harness on the engine when you remove it, you can push the ecu plugs into the engine bay fairly easily. Swap out the ECU's. Swap out the gauge clusters (so your tach works and you have a boost gauge). I'm told the dash wiring harnesses are the same from similar year Supras (pre89 and post89; you will want to verify that). Swap the stuff out that's on the fenders (some parts are different).
That should pretty much cover the basics in the swap, although I haven't actually done it myself (helped someone else do it though)
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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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