The 2 wire colors (at least for an 89) are Yellow and Red/Black. EDIT: I just looked at the harness I have for an 87 N/A Auto, and it's the same colors. You can't just splice the wires together, otherwise your reverse lights will always be on. The page for the TEWD is here.
You need to extend these wires from the engine wiring harness so that they will reach the backup light switch on the manual transmission. If I'm reading the TEWD correctly, the plug on the wiring harness that feeds the signal to the transmission should be connector "A" (located at the bottom of the page linked). The plug that receives the signal from the transmission on your wiring harness is connector "B". The yellow wire is pin 5 in connector A (referred to as A5), red/black wire is B1.
On your manual transmission is a small 2-pin connector (labeled as "C" on the TEWD). You want to connect A5 with C2, and B1 with C1. Once again, the TEWD shows which pin is which at the bottom of the linked page.
After doing this, your backup lights should work as designed.
Now I just hope all that makes sense lol
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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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