[Dave at Pelican Parts]

If there is no fitting on the throttle body for it, then the yellow line does not hang up onto anything at all.

In 74 some/many/all of the US-spec 914s lost their vacuum advance, probably for emissions reasons. The cheap way for VW/Porsche to do this was to use the same distributor dashpot (two fittings) and stop installing the advance fitting onto the throttle body. So that's what they did.

They ran a hose from the advance fitting on the dashpot down under the manifold and didn't hook it up. That was mostly so new owners wouldn't freak out when they saw a fitting that obviously should have a hose with nothing on it. Don't cap the fitting, though, as I hear that interferes with the retard function.

--DD