How to shorten a Tach drive cable?
Auto replacements for spedo cables usually have a fitting that is placed on
one end of the cut to length cable, and crimped in place. The fitting has
the square part on it.
It will be nearly impossible to shape your own end, short of brazing the
end, then grinding down to the desired square shape.
And it will be damn near impossible to get
braze to stick to something so impregnated