FWIW, I spliced in new connectors on my flywheel sensors with no problems (so far at least). I unbraided about an inch and a half of the braided shielding, wound it together, and connected that to the ground pin.
Those are coaxial cables (as Eric says, like TV antenna cables) and they can be successfully spliced or repaired. Fortunately I was taught how to properly repair coaxial cables while in USN aviation advanced electronics school during the Vietnam War. It has come in handy a few times working on depth sounders on US Coast Guard small craft. And maybe on an Alfa some day.
The trick is to get a good connection on the center conductor and then get 100% circumferance repair on the outer braided shield. Once in a pinch I used a piece of someones lunch sandwich aluminum foil to repair the outer shield on a depth sounder. Definately NOT recommended but it lasted several months until a replacement coax could be ordered in.
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various Alfa Romeo Spiders, current 1988 Quad (Red)