I spent a bit of time knocking together a new lower speedo cable.
The principle is simple - take the middle cable from the scrap F, shorten it to the correct length (1350mm), square the end to fit the drive in the gearbox sender.
I started by trying to square the cable at the correct point and got there to a fashion but it was hard going as my Dremel replica (came from Woolworths!) isn't as good as it used to be. I then tried cutting it with the same tool to avoid fraying one would get from a pair of snips.
Unfortunately I did get some fraying so tried to file that with a conventional hand file which just gave more fraying.
Then my steak was done, medium rare, so left it for another time.