Reply to "right angle speedo drive"

Steve, I've fixed a few broken Veglia angle drives, which nearly all Panteras use. If you're interested. PM me for details. There are no new ones but a couple of vendors have NOS assemblies for $250-350 (may also be good used units). As for the internal drive shaft, no one fixes that but RBT and some vendors have those available new or used.
Julian's idea of a magnet is good, but if the complete broken shaft won't come out after you carefully remove that 10mm bolt, try leaving the magnet in place and instead pull on the threaded end of the steel sleeve; both the sleeve and the shaft should come out. The sleeve is o-ring-sealed so you'll need to use some force up and out on the exposed threaded end.
The danger is, the shaft always breaks at the holding relief cut in the shaft, so the lower end may already have fallen inside the cases.
If so and you feel lucky, try fishing around inside thru the case hole with a telescoping magnet, after the steel sleeve is out. At least one member managed to retrieve a shaft in this manner as with the shaft out, the case hole is considerably larger. Otherwise, the ZF must come out and be disassembled; there's not enough room inside for the shaft to lay there safely, so the car should not be driven until it's removed. Good luck.