In order to do your swap easily (if you can call it easy), I'd start by removing the 7MGTE from the engine bay with it's wiring harness attached (just push the ECU plugs through the firewall and unplug the few remaining body connectors).
The turbo harness and ECU will not be able to be used on the 7MGE.
When you install the 7MGE and A340E, install it with both the harness and ECU from the Cressida (I can't remember off hand, but I think there is an additional transmission computer that you'll need to swap in as well). After putting the few odds and ends together, and getting through the unforseen difficulties, that should give you a decently operating drivetrain in the Supra without damaging or modifying most of its components for when you get that JDM 7MGTE.
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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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