3/8in Brass NPT Water Temp Adapter

The 3/8in Brass NPT Water Temp Adapter from AutoMeter is a precision fitting designed for custom engine monitoring installations where factory water temperature sensor ports are unavailable or incompatible with aftermarket gauge clusters. Built for serious enthusiasts and professional mechanics performing engine swaps, turbo conversions, or complete gauge package upgrades, this adapter provides a reliable interface between your cooling system and digital or analog temperature instrumentation.

Constructed from durable brass with a 3/8-inch NPT (National Pipe Thread) male connection, the adapter is engineered to withstand typical engine bay temperatures and coolant system pressures without degradation or thread corrosion. The NPT standard ensures a tapered, self-sealing thread that creates a secure, leak-free connection when properly installed with thread sealant—critical for preventing coolant loss and maintaining system integrity during extended driving or competition use.

This adapter is ideal for those building high-performance street engines, preparing track cars, or restoring classics with modern electronics. It ensures accurate coolant temperature readings essential for proper engine tuning and protection, making it a valuable component for any custom cooling system or gauge retrofit.