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Most nitrous   systems employ a main power arming switch along with   a micro-switch   (circled) located on the carburetor that completes the   electrical circuit   to both solenoids.
My Generation Camaro, Part VI - Nitrous Oxide Systems

Most nitrous systems employ a main power arming switch along with a micro-switch (circled) located on the carburetor that completes the electrical circuit to both solenoids.  View Related Article