When installing a high-performance mechanical water temperature gauge (like Longacre's AccuTech line) into a race engine, the gauge's thick capillary tube and sealing nut rarely fit directly into factory coolant ports. The Longacre 1/2" NPT Water Temp Manifold Fitting is the essential adapter required to bridge that gap and complete the installation.
Machined from solid brass, this straight adapter threads directly into the standard 1/2" NPT coolant ports commonly found on domestic V8 intake manifolds, cylinder heads, or aftermarket water necks. The female end features a precision-machined 5/8"-18 thread, providing a secure, leak-free seat for the mechanical gauge's temperature sending probe.
Key Features
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Mechanical Gauge Adapter: Specifically engineered to adapt the bulky 5/8"-18 nut found on most mechanical water and oil temperature gauges down to a standard engine pipe thread.
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1/2" NPT Male Base: Features a standard 1/2-inch National Pipe Thread (NPT) male end, allowing for a direct, plug-and-play installation into common intake manifold coolant crossover ports without extra fabrication.
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Solid Brass Construction: Machined from high-quality, natural brass.
It will not rust from exposure to water-based racing coolants and provides an excellent, gall-free seal against high-pressure fluid leaks. -
Universal Compatibility: While it is the perfect direct-fit companion for Longacre AccuTech gauges, the standard thread pitch makes it universally compatible with almost any brand of mechanical temperature gauge utilizing a 5/8"-18 probe nut.
