If you look at all four injector connectors at the injector you will notice that all four have a wire that is the same color, I think yellow/black. The wire that is the same color on all injectors is the 12 volt supply, this is NOT the wire for MPGuino. Then you will notice that each injector has a unique color wire and you can hook MPGuino to any one of the unique colored wires for you signal.
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Prius MFD fuel Log
Prius Gallons at fill up Log
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