If the cable is intact, something else has failed.
Take the drive apart, see what drives the cable. If it's a 90* adapter there is a set of bevel gears inside. If it's direct drive something inside is stripped or sheared. It will be obvious once you get into it.
As for the drive on the back of the tach, it's a brass barrel that extends out the back where the cable goes in. It should be smooth and effortless to turn. It can be oiled, something like 3-In-One electric motor oil will work. If you can get the tach out so you can turn it face down, the oil will get in better, just don't over do it.
Also clean the cable and oil the housing with the same oil. The cable needs to move freely inside the housing. If it drags, or the housing has been kinked, or is rusty, the tach will not operate smoothly and will put extra stress on the drive.
As for the wire harness, the split loom works well. It can be bought at about any auto supply in various sizes. Protects the wire and looks professional.
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Today's Featured Article - Ford Super Dexta - by Anthony West. The rusty blue tractor caught my eye as my truck zipped by the farm implement business. It looked so fornlorn amongst the lineup of newer equipment. But it was just the right size for my small farm. I stopped in and asked the proprietor for further information. "It's a 64 Ford Super Dexta", he said. "It's a tough little tractor, although it's a hard starter being a diesel and all." He did manage to get it running, compliments of a can of ether. Once started it putted along pretty good. It
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