He has a switch that is normally closed, so it's normally allowing continuity of the circuit. When he pushes the e brake button (effing brilliant!), it breaks the circuit from that wire to the injectors.
If you use a toggle, just wire it in line the same way.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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