All right, I just crawled underneath the car, and I do have the pickup on the bell housing. It's hard to see, because everything down there is covered in a thick half-inch crust of old engine oil.

So, I'm correct in assuming that that wire goes straight into the cluster?

So my non-working tach in that case can only be caused by either the pick-up failing, a break in the wire or a faulty cluster, right?

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"The MB W123 is so bulletproof, you can drive them forever. Which is a good thing as it takes that long to get anywhere."
Betsie: 1984 W123 300D (hobby, 280k miles)
Myrla: 2001 Mazda Protege 2.0 ES 5spd (daily driver, 130k miles)
The Turd: 2007 Toyota Camry (wife's car, 118k miles)