I removed my intake, and this plug was laying underneath. Any idea where it goes?

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1995 E300 Diesel
1994 E320
1999 C230K
1994 S500 W140
1990 300 SEL

On which car?

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22

thats an OM606.910 I believe from a 95 E300D - in which case there will be one extra wiring plug that does not connect to anything.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

Correct. Any idea what the plug is for....an option maybe?

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1995 E300 Diesel
1994 E320
1999 C230K
1994 S500 W140
1990 300 SEL

I think you will find it connects to your wallet.

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08 R320 CDI current

Past
95 E420
87 300D Turbo 5spd
90 300TE
83 300SD
85 300TD
92 400E
85 190D