I think neutral is an override, actually. It's nothing to do w/ the solenoids, it would be a matter of actually causing a neutral shift in the linkage.
Even the electronically controlled transmissions have to use fluid to shift... it's just that shifting is controlled by a series of solenoids that are activated by a fluid switch, rather than a series of valves actuated by a lever.
The neutral switch would have to open the neutral valve on the transmission. I'm not sure how exactly to do that, honestly.
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