Check the listing for details. 15531 Nitrous Express 2-1/16" N2O Pressure Controller, Gauge, Bottle Heater Kit. Color: Black, Condition: New. Listed at 422.16 USD. 15531 Nitrous Express 2-1/16" N2O Pressure Controller, Gauge, and Bottle Heater Kit Description: When it comes to using nitrous, consistency is key. The more stable you can keep your bottle pressure the more consistent your car will run! The brand new Nitrous Express Pressure Gauge lets you set and maintain a target nitrous pressure by automatically turning your NX bottle heater on/off without leaving the driver's compartment. The Nitrous Express Pressure Gauge features a 5-psi buffer zone below the target pressure to prevent rapid fluctuations of the heater relay. Kit includes the bottle heater element and relay. If needing an adapter manifold for the feedline- Part# 15501 for a 4an main feed line Part# 15502 for a 6an main feed lineWiring: Red wire: +12V Black wire: Ground Pink Wire: Output to ground side of heater relay coil. - connect to white wire of relay harness Purple: Dimmer wire (12V dims display) Yellow: Input from pressure sensor 0.5V – 4.5V - connect to white wire of sensor harness Orange: 5V power to sensor - connect to the red wire of sensor harness Green: Ground to sensor - connect to black wire of sensor harnessShipping is FREE inside the contiguous United States. If shipping to Alaska, Hawaii or Puerto Rico please message us for a quote for additional shipping costs.