Haltech HT-010304 Coolant Temp Sensor 1/8 NPT 27TPI Deutsch DTM-2 Plug Pins

Vehicle Fitment

• Universal - compatible with all Haltech ECU platforms including the Nexus S2, S3, R3, R5, Elite 550, 750, 1500, 2500, and plug-in ECU series
• Suitable for all engine configurations requiring coolant temperature monitoring via a standalone ECU
• Compatible with any thermostat housing, engine block, coolant pipe, or custom fitting with a 1/8 NPT 27TPI thread boss

Fitment Notes

• Thread size is 1/8 NPT 27TPI - the smallest NPT thread in Haltech's coolant sensor lineup. Select based on the thread boss present in your cooling system. For larger threads, see HT-010300 (M12 x 1.5) or HT-010302 (3/8 NPT 18TPI).
• This sensor uses a Deutsch DTM-2 connector, unlike the HT-010300 and HT-010302 which use Delphi connectors. Verify harness connector compatibility before ordering.
• 1/8 NPT is common in many OEM engine blocks, sensor bungs, and compact custom coolant fittings where space is limited.
• Maximum operating temperature is 127°C (260°F) - suitable for normal engine coolant operating ranges.
• Sensor type is NTC thermistor - natively calibrated in all Haltech ECU software.

Features

• Measures engine coolant temperature (ECT) and delivers real-time data to the ECU for cold-start enrichment, warm-up fuel trims, idle speed control, and cooling fan activation.
• 1/8 NPT 27TPI thread - the most compact NPT size in Haltech's sensor range, ideal for space-constrained installations and OEM-style bung locations.
• Built to OEM specifications for reliable, consistent output across the full operating temperature range.
• NTC thermistor sensor type - natively calibrated in all Haltech ECU software for accurate readings straight from the box.
• Deutsch DTM-2 connector provides a secure, sealed, and vibration-resistant connection - a step up from standard Delphi connectors for race and high-vibration applications.
• Compact brass construction designed to withstand high-pressure cooling system environments.
• Includes matching male Deutsch DTM-2 connector (HT-031000) - no separate connector purchase required.
• Temperature range of -20°C to 130°C (-4°F to 266°F) covers the full spectrum from cold-start to high engine load conditions.

Specifications

• Part Number: HT-010304
• Sensor Type: NTC Thermistor (Coolant Temperature)
• Thread Size: 1/8 NPT 27TPI
• Operating Range: -20°C to 130°C (-4°F to 266°F)
• Maximum Operating Temperature: 127°C (260°F)
• Connector: Deutsch DTM-2 (male, included - HT-031000)
• Application: Universal - Engine Coolant Temperature

Included Components

• 1x Haltech Coolant Temperature Sensor (1/8 NPT 27TPI thread)
• 1x Matching male Deutsch DTM-2 connector with pins (HT-031000)

Product Description

The Haltech HT-010304 is a universal coolant temperature (ECT) sensor with a 1/8 NPT 27TPI thread, making it the most compact NPT option in Haltech's coolant sensor lineup. The 1/8 NPT thread is widely found in OEM engine blocks, compact sensor bungs, and space-constrained custom cooling setups where larger NPT threads won't fit. It delivers accurate real-time coolant temperature data to the ECU for cold-start enrichment, warm-up fuel and ignition corrections, idle speed management, and cooling fan relay control - essential functions for any standalone engine management system.

A key distinction of the HT-010304 is its Deutsch DTM-2 connector, included as part number HT-031000. This provides a more robust, vibration-resistant sealed connection compared to the standard Delphi connectors used on the HT-010300 and HT-010302, making it a preferred choice for race and high-vibration environments. The NTC thermistor output is natively calibrated in all Haltech ECU software. For metric or larger NPT thread applications, see the HT-010300 (M12 x 1.5) and HT-010302 (3/8 NPT 18TPI) respectively.