What is the problem you're having?
Do you have the relay pack which allows you to use both transbrake and O/D on the same button or is it only the transbrake alone you want to wire?
I remember it was pretty simple, but I can't remember exactly how I did it.
I think I took 12V from a keyed source (only 12v when key On) to the transbrake button, and from the button down to the transmission.
But I also wired an extra flip switch between the keyed 12v source and the button, as safety so that I can't press the transbrake button on accident while the car is moving.
1988 Ford Thunderbird
306, Procharger D1 w/ intercooler, Holley SysteMAX II, Freddy Brown built AOD, 8.8" 3.55 gears, FRPP Shorty headers, 2.5" exhaust w/ Flowmaster 40's & Magnaflow cats, proud member of Anonymous Alcoholics (runs E85), 5" cowl hood from VFN