I have a 2004 Mercury XR6 150 hp. I have the 5 pin wiring harness that plugs into the control box. I want to wire my Faria tach up. I sold my other hull and am putting the 150 on the new one. The Mercury 5 pin plug is a part # 84-86396 A2. It has 5 wires coming out of the plug. My question is...