JEGS Performance Products 40822 RPM Switch
JEGS RPM Activated Switches allow you to turn accessories on or off at the desired RPM. These switches use push buttons or DIP switches to set the RPM, so you don't need to purchase RPM modules or chips. The Window switch turns on an accessory at the desired RPM and then turns it off at a second higher RPM (ideal for use w/ nitrous so it comes on at a predetermined RPM, and shuts off again before peak RPM) . These switches can handle accessories up to 3 amps (use with a relay to control circuits over 3 amps) . Made in USA.