Good good good.
I wonder what a crank sensor is. I've never heard of one.
I agree that it's a great idea to put it in a spark plug wire set and coil wire. Have you replaced your cap and rotor yet? I've read that these M119 engines are hard an caps and rotors. I usually replace cap, rotors, and wires in sets. In fact, I usually do plugs at the same time, too, for piece of mind.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".