Overview Replace or extend your TCA4 Thermocouple Amplifier's factory harness with this genuine 1.5-metre flying lead assembly. Essential for custom installations where the standard harness won't reach your thermocouple locations, or when building clean engine bay setups that route the TCA4 away from heat sources. Technical Specifications Part Number: HT-049940 Cable Length: 1.5 metres (3 feet) Compatibility: TCA4 Quad Channel Thermocouple Amplifier Connector Type: Flying lead termination Construction: High-temperature automotive grade wiring Why You Need This The TCA4's standard harness works perfectly for most installations, but complex builds often demand custom routing. Whether you're running a front-mount intercooler setup where the TCA4 needs relocating away from radiator heat, or building a clean show car where all electronics mount in the boot, this extension harness solves the reach problem. We see this regularly on RB26 builds where customers want EGT monitoring on each cylinder but need the TCA4 mounted away from the turbo's radiant heat. Don't attempt to splice or extend the original harness—thermocouple circuits are sensitive to resistance changes and junction points that can introduce measurement errors. This genuine Haltech harness maintains signal integrity across the full temperature range, crucial when you're monitoring critical parameters like individual cylinder EGTs on a highly-tuned 2JZ or tracking pre/post-intercooler temps on a big turbo conversion. ECU & System Compatibility Designed specifically for the TCA4 Quad Channel Thermocouple Amplifier, which connects to Elite 550/750/1000/1500/2000/2500 and Nexus R3/R5 ECUs via CAN bus. The TCA4 itself handles four K-type thermocouples simultaneously—perfect for comprehensive temperature monitoring on performance builds. What's in the Box 1x TCA4 Flying Lead Harness (1.5m length) Pre-terminated connections for direct TCA4 connection Complete Your Build This harness is only useful with the TCA4 Thermocouple Amplifier unit itself—contact our team for the complete TCA4 kit if you're starting fresh. Most customers also add K-type thermocouples for their specific monitoring points and additional CAN cable if extending the ECU connection. We keep genuine Haltech thermocouples and connection hardware in UK stock, so you can complete your temperature monitoring setup in one order with fast despatch.
