Common Sense From Jkrowling Again
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No best answer has yet been selected by iwbus. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.You still need the key for ignition positions I and II. The button does the position III business. You need to cut the cables going to position III and route them to your button. Additional cable used to lengthen the original cables should be the same diameter as the original.
If you don't cut the cables and wire the button in parallel with position III you can use either the button or the key to start the engine.