IF (big IF) it's like the one on my '88, it'll be like this:
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Ratchet adjustment:
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The new switch, which includes an extra connector and conductor that my truck doesn't need--but it doesn't get in the way, either.
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These are supposedly self-adjusting--but I had to push mine over a notch or two to get everything to work right. One adjustment for both the backup lights AND the park-neutral safety switch for the starter circuit.
In other words, the truck has to crank in both park and neutral, but NOT in reverse, and the backup lights need to work in reverse, but NOT in park or neutral.