I have a 1992 Evinrude 15 hp and want to install steering, throttle and shifter on my 14 foot Jon boat. How do I do it and what all will I need to do so? Is it possible to go with 1 cable for steering? How does the throttle operate (electric?) and how do I know my motor has what I need? I guess I need to have all the answers from start as I never installed the controls before.