The AudioVox kit comes with a bunch of different style connectors for attaching the servo to the throttle body. I ran my servo cable similar to that shown on the Gadget page.
Here is the piece of linkage I used. It slips in over the throttle cable ball. I had to disassemble the throttle housing on the handlebar to get enough slack in the cable to get the throttle cable ball out.
I had to drill the hole slightly larger.
Here is the overall linkage connection. You want to make sure it doesn't interfere with the normal operation of the throttle.