4AN Male to 1/8in NPT FM Gauge Adapter STR Blue

The 4AN Male to 1/8in NPT Female Gauge Adapter STR Blue from REDHORSE PERFORMANCE is a precision adapter designed for high-performance fuel system, oil pressure, and boost gauge installations in modified vehicles. This straight adapter bridges the gap between AN (Army-Navy) hose fittings and standard NPT (National Pipe Thread) metric gauge ports, making it essential for custom fuel rail builds, turbo setups, and engine monitoring systems where factory gauge provisions don't align with aftermarket hose routing. Whether you're upgrading to a stand-alone ECU with auxiliary gauges or consolidating engine telemetry into a single dash display, this adapter eliminates the need for costly custom-fabricated lines.

Engineered in anodized blue aluminum, this straight configuration resists corrosion and maintains structural integrity under vibration and thermal cycling—critical for engine bay environments. The 4AN male fitting threads directly into standard -4 AN hose and barbed connections, while the 1/8in NPT female port accepts metric gauge senders and pressure transducers commonly found on fuel systems, oil circuits, and intake manifold boost ports. The compact 2.84 x 1.1 x 4.42 inch footprint and lightweight 0.045 lb construction ensure minimal weight penalty and easy integration into tight engine compartments, while the straight geometry provides unrestricted flow paths ideal for real-time pressure monitoring without signal dampening or restriction.

This adapter is indispensable for LS swaps, turbo conversions, and fuel system upgrades where OEM gauge bungs don't match aftermarket plumbing standards. Mechanics and tuners regularly specify REDHORSE PERFORMANCE adapters for reliability and repeatability across multiple installations—the blue anodized finish helps color-code pressure lines in complex multi-gauge setups. Ensure your hose barbs and gauge port threads are clean and use appropriate thread sealant (PTFE tape or -20 weight sealant) on the NPT side to prevent weeping under sustained boost or high-pressure fuel conditions.