I need to know what this double ended plug hooks into on a 1990-1992 500SL. It is located under the carpet on the passenger side floor. It is right next to the round plug for the fuel pump activation signal. The wire coming out of the plug is black with a yellow stripe. I'm pretty sure it is for the vehicle speed signal, but I can't find a definitive answer.

Also, I misspelled identifying in the title and it's driving me nuts...

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1992 300D 2.5 TURBO

1991 560SEL M119.960

1986 300SDL TURBO