ZEX -4an Liquid Filled Gauge Kit

The COMP CAMS ZEX -4AN Liquid Filled Gauge Kit (SKU COM82341) is a precision nitrous oxide pressure monitoring instrument designed for serious performance builders and nitrous system installers. This mechanical analog gauge gives you real-time visibility into system pressure, a critical safety and tuning parameter that directly affects nitrous injection flow rate and engine response. Whether you're diagnosing a struggling nitrous setup or fine-tuning a competition build, accurate pressure readout is non-negotiable for consistent performance and component longevity.

Built with a liquid-filled needle design, this gauge resists vibration-induced needle flutter and fluctuation that plagues air-filled gauges on high-horsepower platforms. The full-sweep 0–1500 psi analog dial provides intuitive, glance-readable pressure confirmation without electronic dependence—critical during on-track or dyno sessions where electrical noise or sensor failure cannot be tolerated. The 1-1/2 inch diameter faceplate is legible from across an engine bay, while the black face and robust mechanical movement ensure durability in harsh underhood environments. Installation uses a straightforward 1/8 inch NPT port connection with an included -4 AN adapter, making integration into existing or new nitrous manifolds and distribution blocks straightforward for builders familiar with AN plumbing standards.

Street performance enthusiasts, bracket racers, and engine builders rely on this gauge kit to validate bottle pressure stability, detect regulator drift, and troubleshoot flow anomalies before they damage pistons or blow gaskets. The compact footprint (2.9 x 2.05 x 4.05 inches, weighing just 0.33 lbs) allows flexible mounting on valve covers, fenders, or custom gauge panels. This kit is essential for any dedicated nitrous installation running single or multi-stage systems, from mild street shots to full competition setups targeting consistent ETs and predictable power delivery.