Thanks Peter
I am fairly certain that the neutral safety switch is the same as the 320 box.
Which computer would the trans be connected to? The car has CIS-E (KE-jetronic) & EZL fuel & ignition systems. The only major difference is that the M104 engine has variable valve timing (but still no cat).
Unfortunately my CDs wont print the wiring diagrams for some reason.

Adrian

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90 300TE 24v (M104 eng) 207K miles
87 300TE (M103 eng) 269K miles (and never had the head off!)
86 300TE (M103 eng) 230K+ miles (donor car)
95 Toyota Lucida diesel 4wd
86 200T 165K miles (sold)