mv box wire up HELP

[TopSecret]

ok im getting my mv built box wired up and have a question as mike is on holidays as is shane of 1jz747 fame

theres a sensor on the passanger side of the box, its the second one back from the front of the box.
In the mv wire up diagram it shows only two of the 3 wires to be wired up and were not sure what to do with the third one and what wires do we use.
Also do we ground the solenoids or give them positive power. diagram doesnt say
Anyone please help me as we gotta get this done as the car is going to summernats and has to get on the dyno asap