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The injectors run at 12V. Make sure you splice into the wire after the injectors are all spliced together. It might be easier to do this outside of junction 12.
I'd highly suggest getting either a normally closed switch or NC relay. Theres no real need for a relay, although if a NC relay fails or your switch fails you likely won't have a problem. So, it does provide a little extra fail safety. I wouldn't mess around using an NO relay/switch.
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