Why is there a crankshaft position sensor on my 240D? It has no tach? Is this for the cruise control?

Is the wire harness plug for the neutral safety switch on the transmission available from the dealer or other source? On both 240Ds the plug has gone brittle and has broken. Helllllllp!

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1984 280SEL, 62,000 miles
Euro model in the USA
1983 300D (Totaled out 10/2004)
New Factory Mint Green paint
Palomino int
1982 240D (Steak dinner for two)

I believe it was for some kinda diagnostic tool that the dealers had.

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Jim