Monitor the pressure left in your nitrous bottle at all times with the Zex nitrous pressure gauge. The Zex pressure gauge's superior quality ensures a long life of accurate pressure readings. Internal components are protected from severe vibration often found in race cars & serious street/strip vehicles. The gauge is also anodized for a high-quality, competition appearance. Works with all major brand nitrous systems. Comes with inline adapter for -4AN & -6AN delivery lines and measured 0-1500 PSI. The part number for this item is Zex 82341