I talked one one of the guys on LegacyCentral into trying this on his Legacy. He said it made sparks and now that pin on his TCU is dead.
From what I can see, the Legacy and SVX TCU should be the same hardware. Some guys here are running Legacy gearboxes, so how can the wiring be different? It doesn't make any sense.
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Subaru ECU and TCU Website
1992 Alcyone SVX Version L
1992 Alcyone SVX Version L
1994 Alcyone SVX S40-II
2004 Subaru Legacy 2.5 SE Sports Tourer
1996 Subaru Legacy 2.2 GX Wagon
1988 Subaru Justy J12 SL-II