Vehicle Fitment

• Universal — compatible with any nitrous system using a bottle heater and external pressure sensor

Fitment Notes

• Universal fitment — not vehicle-specific; works with any NX or compatible aftermarket bottle heater relay setup
• Gauge only — does not include bottle heater element or relay harness; sold separately
• Requires 12V DC power source; connects to existing bottle heater relay via included wiring leads
• Compatible with NX pressure sensor (sensor wiring: 0.5V–4.5V signal range)

Features

• Automatically controls bottle heater relay on/off to maintain a user-set target nitrous pressure — no manual intervention needed
• Built-in 5-psi buffer zone below target pressure prevents rapid relay cycling and heater fluctuation
• 2-1/16 in. digital display face allows remote mounting in the driver's compartment for at-a-glance pressure monitoring
• Adjustable target pressure setting lets the driver dial in the exact bottle pressure needed for the tune-up
• Dimmer wire (purple) allows display brightness adjustment for day or night visibility
• Reads 0–1,500 psi — covers the full operating and safe storage pressure range of standard nitrous bottles
• Simple color-coded wiring for straightforward integration into existing relay harness and sensor circuits

Specifications

• Part Number: 15531G
• Gauge Diameter: 2-1/16 in.
• Pressure Range: 0–1,500 psi
• Display Type: Digital, Black Face
• Voltage: 12V DC
• Buffer Zone: 5 psi below target pressure
• Sensor Input Signal: 0.5V–4.5V (Yellow wire)
• Sensor Power Output: 5V (Orange wire)
• Heater Relay Output: Ground-side trigger (Pink wire to white relay harness wire)
• Dimmer Input: 12V (Purple wire)
• Fitment: Universal

Included Components

• 1x 2-1/16 in. digital N2O pressure gauge / heater controller (15531G)
• 1x Pre-wired harness (Red, Black, Pink, Purple, Yellow, Orange, Green leads)

Product Description

The Nitrous Express 15531G is a 2-1/16 in. digital nitrous pressure gauge that doubles as an automatic bottle heater controller. Once installed and wired to an existing NX bottle heater relay harness and pressure sensor, the gauge continuously monitors bottle pressure and triggers the heater relay on or off to maintain a driver-set target pressure — all without leaving the cockpit. A built-in 5-psi buffer zone below the target setting prevents the relay from cycling rapidly, extending component life and keeping pressure stable between passes.

The gauge mounts in any standard 2-1/16 in. gauge pod and connects via color-coded leads to the bottle heater relay (pink wire) and pressure sensor (yellow, orange, green wires). A purple dimmer wire allows display brightness to be adjusted for track or street conditions. Note that the bottle heater element and relay harness are not included and must be sourced separately. This gauge is the standalone controller unit only.