Coolant Temp Sensor - 1/8 NPT Thread

Overview

The Haltech 1/8 NPT Coolant Temperature Sensor delivers precision engine temperature monitoring for serious builds. Essential for accurate fuel maps, ignition timing, and cooling fan control, this sensor ensures your ECU has the critical data needed to protect your engine and optimise performance across all operating conditions.

Technical Specifications

• Part Number: HT-010304
• Thread Size: 1/8 NPT (National Pipe Thread)
• Sensor Type: NTC Thermistor
• Operating Range: -40°C to +150°C
• Response Time: Fast-response for real-time monitoring
• Construction: Brass body with sealed electrical connection

Why You Need This

Coolant temperature is fundamental to every aspect of your tune. Without accurate readings, your ECU can't properly manage fuel enrichment during warm-up, optimise ignition timing for different operating temperatures, or control cooling fans and auxiliary systems. Generic aftermarket sensors often provide inconsistent readings or fail completely under the heat cycling common in modified engines, leading to poor running conditions, detonation, or worse — catastrophic overheating.

The 1/8 NPT thread size makes this sensor perfect for tight installations where space is at a premium. We see this regularly on LS swap projects where the standard thermostat housing locations are compromised, RB25/RB26 builds requiring additional monitoring points, and classic car EFI conversions where you need to tap into existing cooling system components. The compact design and reliable NPT sealing make it ideal for custom radiator installations, remote thermostat housings, and supplementary monitoring points on high-performance cooling systems.

ECU & System Compatibility

Compatible with the full Haltech Elite and Nexus range, including Elite 550, 750, 1000, 1500, 2000, and 2500 models, plus all Nexus R3, R5, and Rebel ECUs. The sensor connects directly to any analogue temperature input and is pre-calibrated in Haltech's ECU Manager software for immediate use.

What's in the Box

• Haltech 1/8 NPT Coolant Temperature Sensor
• Pre-wired connector with flying leads
• Calibration data (pre-loaded in Haltech ECU Manager)

Complete Your Build

Most customers completing a comprehensive sensor package also add the HT-010200 Air Temperature Sensor for inlet air monitoring and HT-010100 GM 1 Bar MAP Sensor for manifold pressure sensing. This combination provides your Haltech ECU with the three critical environmental inputs needed for accurate load calculation and fuel delivery. All sensors are in stock at Billy's Speed Shop with same-day dispatch, and our technical team can advise on optimal placement and wiring for your specific application during pre-sales consultation.