(They gave me my bike back with zero oil in it... not a drop! Thinking a "professional" motorcycle garage could give it back to me without any oil wasn't even a scenario I considered & drove it for 2 days before I checked it...
I’m sorry but something about this part is wrong. You’d be lucky to get 10 miles out of a motor with no oil in it, and you’d hear a problem with the engine before then.
Back to the speedo cable. Align The square section of the cable with the square section of the drive, then screw the nuts down. The hex nut goes to the drive end.
Don’t pin the cable too tightly to the frame along the swing arm as it will damage it, on my Lightning I’ve made a short daisy chain out of zip ties to allow to free movement to the cable, but not enough that it’s dragging on the floor.
Don’t over tighten the nuts, I think the hex size is 5/8 AF from memory but this might vary between cable maker. Don’t overtighten the hex, otherwise you’ll bugger up the speedo drive when you come to unscrew it another time.
Vintage British Cables in Canada make the best cables!!