FiTech 70050-9 LS3/7 Knock Sensor Sub Harness

FiTech's 70050-9 is a direct-fit knock sensor sub-harness (extension harness) engineered for Gen IV LS engines with side-mounted knock sensors (LS3, LS7, and compatible variants). This essential wiring sub-harness connects the knock sensors to your FiTech Ultimate LS EFI system, enabling precise detonation detection for safe timing adjustments, optimal performance, and engine protection-especially in boosted, high-compression, or tuned setups. A must-have replacement or addition for clean, reliable integration in FiTech LS conversions and builds.

Key Features

• LS3/LS7-Specific Compatibility - Tailored for Gen IV LS engines with side-block knock sensor locations (LS3, LS7, and similar)
• Plug-and-Play Extension - Direct sub-harness connects knock sensors to the FiTech ECU harness for accurate detonation monitoring
• Essential for Safe Tuning - Allows the system to detect knock and retard timing automatically, protecting your engine under load or boost
• Durable Construction - High-quality wiring and connectors built for automotive environments and long-term reliability
• Easy Upgrade/Replacement - Simple bolt-on addition or swap for FiTech Ultimate LS systems, ensuring full knock control functionality