I couldn't find the torque spec for the neutral switch although I did find a warning of the importance of the correct torque.
I ended up putting the bike in first gear, installing the switch with a fresh crush washer and tightening it 1/6 turn at a time until my ohmmeter showed no continuity between the switch terminal and the switch body.
Shifting back into first made the terminal short to the ground so I'm optimistic.
Andrew in Ann Arbor