Oil Pressure Fitting

The JOES RACING PRODUCTS oil pressure fitting (model 42800) is a precision adapter engineered for high-performance engine monitoring systems and custom automotive builds. This straight-port fitting converts a 4 AN male connection to a standard 1/8 inch NPT male port, making it an essential component for racers, tuners, and serious enthusiasts who need reliable data acquisition and pressure gauge installation. Whether you're building a track-focused engine or upgrading a street machine with accurate oil pressure monitoring, this fitting delivers the durability and precision required in demanding applications.

Constructed from lightweight aluminum and finished in black anodize for corrosion resistance, this 2.25-inch fitting combines material efficiency with longevity in high-vibration engine environments. The straight-port design eliminates flow restrictions and pressure losses that can occur with angled adapters, ensuring accurate oil pressure readings at your gauge or sensor. The 4 AN to 1/8 NPT conversion enables seamless integration between modern high-flow braided hose systems and traditional NPT-threaded engine blocks, offering flexibility across vintage and contemporary powerplants. Black anodized finish provides both aesthetic appeal and enhanced durability against oil contamination and thermal cycling.

Mechanics and engine builders rely on this fitting when installing aftermarket oil pressure gauges, data logging sensors, or remote oil filter systems where standard port access is unavailable. Installation is straightforward—apply appropriate sealant to the NPT threads, torque to manufacturer specifications, and connect your 4 AN hose or gauge line. The minimal weight of 0.03 lbs ensures no impact on vehicle dynamics, while the compact 3 x 0.65 x 3.6 inch profile fits tight engine bay layouts common in performance and race applications. This single-unit fitting is ideal for custom builds where precise pressure monitoring directly supports tuning, diagnostics, and long-term engine reliability.