Turn signal switch wire number question (AorB)

[Myrddin]

He folks. I’m running the signal indicators on my Spedomiter gauge to the wires on the turn signal switch. I remove the cannon plug on the switch that has the lever (not the flasher box). I see the diagram calls for wires 460B and 461B. I can only identify pins A, and B which are 460A and 461A (no B on the wire tag). Can you tell me if it’s the same wire? And if so what does it list the wire as B vs A?

thnx

 

[Myrddin]

I may have figured it out. It’s the same wire. B seems to be located at the light, where A is at the switch. Can anyone tell me what A and B stand for. And if this a normal way to identify the source vs destination?