[b3lha]

I had another look at Harvey's diagram on my computer at work which has a much better screen. I can see it clearly now.

On my diagram (USA/JDM), the speed sensor has a Yellow/Red wire that runs to pin a11 of the TCU, and branches off to the ECU, speedo, cruise control etc.
http://www.subaru-svx.net/photos/files/b3lha/33820.jpg

On Harvey's diagram (Aussie/Euro) the speed sensor has a white wire that goes into pin a17 . Then a Yellow/Red wire comes out on pin c6 and feeds into pin a11 of the TCU and branches off for the ECU, speedo, cruise control, etc.
http://www.subaru-svx.net/photos/files/oab_au/13771.jpg

I think the TCU has a circuit that a17->c6 that converts a "white-wire" Aussie speed signal to a "Yellow/Red-wire" JDM speed signal. These pins are not connected on either of my JDM cars. Since you now have a JDM transmission you need by bypass this circuit.

I would connect the white wire to the speed sensor in the diff. At the TCU end, I would snip it where it goes into a17. Then I would snip the wire coming out of c6 and solder the two together. Make sure to leave some wire hanging from the plug incase it doesn't work and you need to reconnect them.

That's my best guess, but it's untested. I would appreciate it if someone else would have a look at the diagrams and see if they agree. If you decide to try it, please post here whether it works or not.

http://www.subaru-svx.net/photos/files/b3lha/33817.jpg

Phil.