Start only in "park" with Winters neutral safety switches. Designed for use with your Winters Sidewinder shifter, these switches require the shifter to be in park position in order to start the engine. Installation of the switches is easy, with the wiring being even easier. Without this switch your engine is able to start in any gear--dangerous not only for you, the driver, but also for those standing outside your car. Don't start in gear; add neutral safety switches to your Winters Sidewinder shifters.