You're using the harness that came in the car, correct? The auto harness?
If you're looking for a quick fix, run wires directly from the switch on the tranny to the YEL and GRN/BLK wires on the 10-pin plug at the old auto shifter location. If you want everything to be inside the harness, do the following:
1) solder a lead onto the AT lockup solenoid wire on the harness that will connect to one of the reverse lights.
2) Unplug and remove the ECU.
3) Run a wire from the YEL wire on the 10-pin plug by the shifter....
4) ...the YEL wire on the white ECU plug (I call it pin A8). It's four over on the bottom when viewing this plug from the wire side. If you have a HELM, it should be the pin that controls the auto tranny lockup solenoid. Use a meter to double check.
Now you have one half of the reverse lights wired up.
It's been so long I can't remember how I wired up the other half the way it ran through pre-existing wires, but I'll tell you how I have it wired up now and it works.
Pretty much I just ran a wire from the GRN/BLK wire on the 10-pin plug by the auto shifter under the carpet, under the dash, and came out by the driver's shock tower and then ran it inside the engine wiring harness until it popped out by the tranny. I had to unwrap electrical tape and pop off the loom to get the wire inside the harness. If you do this, zip ties are your friend to help hold the harness in it's original shape once the loom and tape are off.
Hope it helps, let me know!
SVOboy 
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