Few question on my DEMO

I have a few things Im unsure of. Im tearing apart my scamp and cleaning up the engine bay. I have a few things in the way. The speedo cable can I just cut that at the fire wall and but a new one? This one is corroded anyways.

Also when I took the fenders off on the passagerside there is a wire that come s out the side with something on the other end what might that be?

Also is the linkage that comes off the gas pedal going to work with my RB 440?