Well, I haven't chimed in because I've never done this swap, but I assume the issue you're running into is the dash harness (B1) plug. If I were to guess, your 1JZ harness probably has a B1 plug similar to that of a post 89 grey plug Supra. If that's the case you need to either a) swap out your dash harness and with one from a post 89 Supra or b) splice in the B1 plug from your 7MGE harness. In both cases I don't believe your N/A tachometer will work properly, due to the different ignition systems, so you will need to address that.
I posted a link a while back about plug differences, I'll pull it up and if its relevant I'll link it in this thread.
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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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