Used the multimeter to find the pins for the 3 mystery wires. Marked the locations on the connector drawing and secured them to the other wires I don't need. As you can see in photo of the wires in my hand there are 3 ground wires, two aux fuel tank wires and the 3 extra wires. Not sure what to do with the extra wires so I'll give AFS a call for suggestions. Added a molex ground wire to the manifold pressure connector then soldered the fuel, oil and manifold pressure ground wires to the ground wire from the engine sensor connector. Added several pieces of heat shrink to secure the connection and add some strain relief.