Temp Sensor 280deg SMI w/QD Lead & Fitting

The Longacre Temp Sensor 280deg with Quick-Detach Lead and Fitting (Part No. 52-43500) is a precision temperature measurement instrument designed for engine monitoring and diagnostics in high-performance automotive applications. This electric temperature switch activates at 280 degrees and features a 1/2-inch NPT male connection, making it suitable for direct integration into cooling systems, manifolds, or custom sensor bundles without adapter hardware.

The quick-detach lead design eliminates the need for permanent wiring connections, reducing installation time and enabling rapid sensor swaps during track testing or engine development cycles. The 280-degree threshold is calibrated for warning or shutdown logic in systems requiring mid-range thermal cutoffs—typical for performance engines running elevated coolant temperatures or for auxiliary electric fan activation. The 1/2-inch NPT fitting accommodates standard engine block ports and coolant manifold applications across numerous racing platforms and aftermarket builds. Its compact 0.06-pound weight and minimal footprint (2.4 x 0.75 x 3.55 inches) ensure minimal intrusion into tight engine compartment layouts.

This sensor is essential for builders and technicians running custom cooling systems, standalone engine management, or aftermarket fuel injection setups where OEM coolant temperature inputs are unavailable or unreliable. Teams operating at the track, dyno, or in endurance events rely on independent temperature sensing to prevent catastrophic thermal events and to log real-time data during performance runs. The Longacre brand is recognized among grassroots racing and performance shop professionals for producing straightforward, field-proven instrumentation that integrates reliably into systems where precision and repeatability matter.