RPM Activated Window Switch

The RPM Activated Window Switch by MSD IGNITION is a precision electronic control module engineered for performance-focused enthusiasts who demand responsive, RPM-dependent circuit activation in their engine management systems. This chip-adjustable switch executes circuit commands at user-defined RPM thresholds, making it essential for progressive fuel management, nitrous oxide systems, turbo boost staging, or auxiliary cooling fan engagement. Whether you're tuning a street car for efficient powerband delivery or building a track machine with staged performance systems, this single-circuit relay provides the electronic intelligence to activate accessories exactly when engine speed and load conditions demand them.

Built with MSD's reputation for reliability in high-vibration automotive environments, the RPM Activated Window Switch integrates seamlessly into factory and aftermarket ignition systems that output a tachometer signal or coil negative output. The chip-adjustable design allows field customization of activation points without component swaps—a critical advantage when fine-tuning fuel delivery curves, turbo spool timing, or accessory engagement relative to engine speed. The single-circuit configuration provides one independent relay output, meaning each switch controls one auxiliary circuit; multiple units can be networked for complex multi-stage activation strategies. Compact dimensions (6.1 x 1.55 x 7.85 inches) and lightweight construction (0.46 lbs) enable discreet underdash or engine bay mounting without compromising wiring integrity or thermal management.

Mechanics and tuners routinely specify the RPM Activated Window Switch for naturally aspirated, turbocharged, and supercharged platforms requiring progressive fuel enrichment, fan staging, or secondary system control tied directly to engine speed ramping. Installation requires basic electrical knowledge—signal input from tach line or coil negative, 12V switched power, ground, and relay output to your target accessory. This modular approach eliminates expensive engine control unit reprogramming while maintaining OEM-quality circuit isolation and thermal stability across extended acceleration runs. Whether you're managing multi-stage nitrous deployment, progressive turbo boost control, or auxiliary cooling demand, the RPM Activated Window Switch delivers repeatable, adjustable performance without compromise.