68 C10 Neutral Safety Switch connection

[writerDennis]

I'm in the process of rewiring my '68 Chevy C10 that has a small block and 700R4 combo. It appears to have the stock neutral safety switch at the base of the column and it has four electrical terminals. I'm using a Painless Wiring vehicle specific wiring kit, but they do not show which terminals should be used for the N/S or which one should be connected to the back up lights. Does anybody know which terminals are which? Also, what is the fourth terminal use for?

The attached photos are not the best, but perhaps they will help some.

Thanks in advance.