Okay, that is the pre-89 spoiler, so your Yellow Box should be the correct one. Well, I was hoping I could help you out with this but that's pretty much all I can think of...
You might want to use a Volt Meter and check for Voltage fluctuations out of the sending unit when someone presses on the brake. I don't know what the power is supposed to be, but if it's working there should be a change.
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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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