that's already tremendously helpful, Sixto, thank you. Is the overboost sensor that giant knot sticking out of my intake manifold on the very top of the engine? That's the sensor I was trying to describe (poorly) in my post. It has one single wire connector sticking out pointing toward the driver's side of the car.

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Cantabridgian

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1987 300TD Black/Palomino 120k on donor engine (thank you CS), 305k on everything else

MISSED 1985 300CD Blue/Palomino 250k lovely but had to part with it; now wife has Jetta TDI, you know how it goes