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The wiring diagram should show the wires coming from each injector and going to the ECU are each a different color (tan, brn/blu, brn/yel, and white or something like this). These are how the injector gets it's ground, inside the ECU. The other wires from each injector are all red in color and go to a common point. This is not a ground, but a junction point for hot wires. Unwrap the fuel injection harness far enough to find each of the red wires and follow to the junction. Cut them, strip and connect the 4 together plus 1 wire running to your switch. Then connect the other wire to your switch to the junction point the red wires used to be connected to.
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