Assuming (dangerous) the console pod harness connector will mate with the rider headset connector on the non-Ultra overlay harness, just run the console pod harness forward under the gas tank console, not under the gas tank/along the frame. That's how my buddy's console pod harness mounted on his '06 EG Classic when he added CB.
What instructions are telling you to route the console pod harness along the frame and under the gas tank?
Are you adding rear speaker pods with passenger controls and headset connector ala the Ultra?
Carl