Haltech HT-010865 1/4in Open Tip Thermocouple 1.18M 46.5in K-Type TCA2 TCA4

Vehicle Fitment

• Universal - suits naturally aspirated and forced induction engines requiring exhaust gas temperature (EGT) or high-temperature monitoring
• Compatible with Haltech TCA2 and TCA4 thermocouple amplifiers for use with all Haltech ECU platforms including the Nexus and Elite series
• Also compatible with any device or data logger accepting a standard K-type thermocouple input via mini K-type connector

Fitment Notes

• Requires a Haltech TCA2 or TCA4 thermocouple amplifier - this thermocouple does not connect directly to the ECU without an amplifier.
• Fitting hardware (weld-in bung, nut, and ferrule) is NOT included. Order separately - common options include Haltech's 1/4" weld-on bung kits.
• The open tip design provides faster thermal response than sheathed probes but is more fragile - avoid direct contact with exhaust headers or other solid surfaces during installation routing.
• Cable length is 1.18M (46.5") - one step longer than the HT-010863 (0.95M / 37.5"), suited to installations where the TCA amplifier is mounted further from the exhaust sensor location, such as a firewall or dashboard position. Longer variants are available from Haltech for extended routing requirements.

Features

• Open tip (exposed junction) design delivers fast, accurate temperature response for real-time EGT, manifold, turbo inlet/outlet, or oil temperature monitoring.
• Operating range of 0°C to 1,100°C (32°F to 2,012°F) - covers the full spectrum from cold start to extreme EGT conditions under race boost levels.
• K-type thermocouple output - the industry-standard thermocouple type for automotive EGT applications, compatible with a wide range of amplifiers and data loggers.
• Terminated with a mini K-type connector for direct plug-in connection to Haltech TCA2 or TCA4 amplifier inputs.
• Suitable for both naturally aspirated and forced induction applications - from track day monitoring to full race builds.
• 1/4" probe diameter provides a balance of thermal mass and durability for exhaust and high-heat environments.
• Cable length of 1.18M (46.5") accommodates longer engine bay routing where the TCA amplifier is mounted at the firewall or inside the cabin.

Specifications

• Part Number: HT-010865
• Type: Open Tip Thermocouple (Exhaust / High-Temperature)
• Thermocouple Type: K-Type
• Probe Diameter: 1/4"
• Cable Length: 1.18M (46.5" / 1180mm)
• Operating Range: 0°C to 1,100°C (32°F to 2,012°F)
• Connector: Mini K-Type (included)
• Required Amplifier: Haltech TCA2 or TCA4
• Fitting Hardware: Not included - order separately
• Application: Universal - EGT, manifold, turbo, oil, or high-temperature monitoring

Included Components

• 1x Haltech 1/4" Open Tip Thermocouple (1.18M / 46.5" cable length)
• 1x Mini K-Type connector (pre-terminated)

Product Description

The Haltech HT-010865 is a 1/4" open tip K-type thermocouple with a 1.18M (46.5") cable, designed for exhaust gas temperature (EGT) monitoring and other high-temperature measurement applications on both naturally aspirated and forced induction engines. It provides additional cable length over the HT-010863 (0.95M / 37.5"), making it the better choice when the TCA amplifier is mounted at the firewall, behind the dash, or in any position that requires routing the cable fully across the engine bay. The open tip design delivers rapid thermal response, capturing fast EGT changes during boost transitions and high-load conditions. Operating range is 0°C to 1,100°C (32°F to 2,012°F).

The thermocouple terminates in a mini K-type connector and plugs directly into Haltech's TCA2 or TCA4 thermocouple amplifier, which is required for ECU or data logger integration - the probe does not connect directly to the ECU without an amplifier. Fitting hardware (weld-in bung, nut, ferrule) is sold separately. Haltech offers this thermocouple across a full range of cable lengths - from 0.72M (HT-010861) through to longer variants - to suit any chassis routing requirement.