I too have a A340 at home but the output shaft is smaller then that of the A341. The sensor I to have the 4 prong thingy but I'm tracking one done which was fitted in the cars which didn't have ABS ie. MX83 GLi or MA70 pre 1988. I got a 32 tooth one as well but that is useless...
Thus MX73 (5MGE) and MX83 (7MGE) gearboxes have diffent sized output shafts on the back of the gearbox.
Cheers.
Shit, I threw an entire 7M and A340E(non-ABS) down the tip only last week(minus a few bits), though I have another in-car ready to scrap.