Another option is try and get your hands on an early Toyota Crown ECU
from Japan. The early Ecu's had a seperate computer for the auto transmission. Toyota part #'s are 89661-30432 and 80661-30430, plug configuration is 26p 16p 22p. Everyone says that it's hard to find the harness for these computers but if memory serves me correctly, I got a computer harness that will fit the 1uz ecu out of an 89 or 90 4Runner. Now the colour code of the two harness is not the same, but with wiring diagrams from a Crown and a 4Runner of the proper years that's not a huge obstacle.