4500 Billet Micro Switch Bracket Kit

The 4500 Billet Micro Switch Bracket Kit from Nitrous Oxide Systems is an essential control component for carbureted nitrous oxide injection systems, specifically engineered for Holley 4500 carburetor platforms. This kit addresses a critical need for serious power adders: reliable, precision-engineered activation and safety control. Whether you're tuning a street machine, bracket racer, or high-performance drag car, the micro switch assembly provides the electrical interface needed to safely engage your nitrous oxide system under precise throttle conditions. Designed and manufactured by NOS—the trusted standard in nitrous technology—this bracket kit ensures your activation circuit operates consistently across countless passes.

The billet aluminum construction delivers durability and minimal deflection under high-vibration engine bay environments, while the included mounting bracket integrates seamlessly with Holley 4500 carburetor geometry. The micro switch itself is a precision electrical component that monitors throttle position and sends a trigger signal to your nitrous control solenoid—activating boost only when throttle conditions are met, preventing accidental or unsafe engagement. This fail-safe design is critical: uncontrolled nitrous activation can cause catastrophic engine damage, so proper electrical control is non-negotiable for any serious nitrous installation. The compact 3.2 x 1.3 x 4.2-inch package and featherweight 0.1-pound specification ensure zero performance penalty and effortless installation in tight engine bays.

This kit is ideal for carbureted nitrous systems where OEM electronic throttle control is unavailable, making it indispensable for classic muscle cars, vintage race platforms, and custom carb-equipped builds. Installation requires basic mechanical skill and electrical knowledge; the bracket mounts directly to Holley 4500 carburetor bodies, with wiring routed to your nitrous solenoid and ignition source. Builders and engine shops frequently specify NOS micro switch assemblies as the control backbone of reliable nitrous kits because they eliminate guesswork and provide repeatable, safe activation. If you're running a Holley 4500 carburetor and planning a nitrous oxide system for sale or upgrade, this bracket kit is the proven electrical foundation your build demands.