Please locate the year and engine code applicable to your vehicle. The ‘Signal Wire’ Column is referencing the color of the Factory Signal Wire. The ‘Ground’ Column is referencing the color of the Factory Ground Wire. The ‘Switch Position’ Column is referencing the Switch Position on GlowShift’s Fuel Rail Pressure Gauge. ‘1 and 2 Up’ means both switches on the gauge should be up. ‘1 and 2 Down’ means both switches should be down.