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Another electrical “must” is this inertia switch. To function correctly, it must be mounted in an upright position as shown. This switch will cut electric power to the fuel pump in the event of a collision. Doing an EFI conversion without one would be foolhardy. On EFI engines, fuel pressure can reach 35–40 psi. This is very high pressure. Without this switch, you’d be pumping raw gasoline like a garden hose from a broken line or other fuel system damage. We don’t need to explain why that is dangerous.
5.0L Engine & AOD Transmission Swap

 Another electrical “must” is this inertia switch. To function correctly, it must be mounted in an upright position as shown. This switch will cut electric power to the fuel pump in the event of a collision. Doing an EFI conversion without one would be foolhardy. On EFI engines, fuel pressure can reach 35–40 psi. This is very high pressure. Without this switch, you’d be pumping raw gasoline like a garden hose from a broken line or other fuel system damage. We don’t need to explain why that is dangerous.  View Related Article