[tmoble]

That's a throttle cable, originally used for when there was something attached to the PTO, a winch or whatever. It's like a choke cable, but it attaches to the throttle instead of the choke. Obviously not a substitute for cruise as it doesn't release the throttle if you apply the brakes, add more throttle if you go up a hill, let off while going downhill, etc. SOrt of risky to use it for a cruise but it can be done, has been done many times.