Temp Gauge Fitting

The Longacre Temp Gauge Fitting (SKU LON52-46150) is a precision brass adapter designed for racing and high-performance engine monitoring systems. This straight-threaded fitting bridges measurement instruments to engine blocks and coolant passages, making it essential for teams that demand real-time temperature data during competition or dyno testing. Whether you're running a dedicated race car, performance truck, or test bench, accurate coolant temperature monitoring directly impacts engine tuning and safety protocols.

Engineered from brass in natural finish, this fitting converts a 5/8-18 inch female thread to 1/2 inch NPT male thread, allowing seamless integration of temperature gauges into standard engine ports. The straight configuration eliminates flow restrictions and provides direct line-of-sight contact with coolant, ensuring minimal lag in temperature readings. Brass construction delivers superior corrosion resistance in wet environments while maintaining thermal conductivity for responsive gauge response. The 0.09 lbs weight and compact 4.15 x 0.9 x 5.55 inch profile suit tight engine bay installations without sacrificing durability.

This adapter is ideal for engine builders, fabricators, and racers upgrading cooling system monitoring. It pairs with most aftermarket temperature gauges and OEM sensor ports, simplifying gauge installation on LS engines, carbureted builds, and late-model platforms. The NPT male connection ensures leak-free sealing when paired with standard thread sealant. For motorsports, street performance, and marine applications, this Longacre fitting delivers the reliability required for continuous operation at elevated temperatures and demanding duty cycles.