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Roger,
You have to imagine the worst case scenerio. The idea is, if you are knocked unconscious in an accident, you don't want anything to create a spark that might ignite leaking gasoline and fry your hide. If the transmission is knocked out of gear, the engine could keep running. Even if it stalls, the fuel pump could keep running. Your dash switch is only good if you can turn it off. The inertia switch is supposed to protect you in this situation. To do that, it must be wired to cut off the fuel pump and the ignition.
I know that the inertia switches in my Lotus Elise and my Jaguar S-Type are both wired this way. For racing requirements, an external safety switch should do the same thing.
RallySnake
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"It doesn't have anything on it that doesn't make it go faster."
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