With the RF harness already in place do I need to run the Speedhut harness to the Speed Sensor and Fuel Level or can I just splice into the RF harness. . I see only one wire from the fuel level. I assume the other goes to ground. The Speedhut harness has two wires and I assume one is ground. If I connect one and ground the other will it work? If its best to run the harness fine thats what I'll do. I just don't know if there is a advantage to the extra wires.