Megajolt TPS wiring

[brainbug007]

I'm a bit confused about how the wiring for the tps goes with the MJ. My tps has 3 wires, blue, blue/black, yellow. The yellow wire is the center of the 3 and I'm guessing this is the signal input into the MJ on pin 10? Then according the diagrams, the ground wire on pin 9 gets sent to the tps. Does this become the positive into the tps so to speak and the vref coming from the tps becomes the negagive return from the tps? If so how does the MJ then get grounded back to the battery?