I think he was trying to source a !JZ harness the previous owner botched it up.
All thats stopping this from running is the harness.
I think this might be a harsh extreme but if you cant find a virgin 1jz harness call dr tweak and ask him how much for a ready to install 1JZ harness brand new & turn key.
Just let dr tweak know if it is pre or post 89 supra body jza70 or soarer ecu. It might cost you your left nut but you will get it running sooner.
There is only 1 other solution I could think of and thats to call aaron at driftmotion & get a stand alone with complete field harness and just splice the field harness into the factory connectors/sensors use the 7M efi harness utilizing c1, reverse switch, AC system, HL power,starter wires / body connectors ECU power wires off the 7M system but wiring the stinger into it and using aarons base tune.