Michigan Motorsports LS 3-Wire Extension Harness 24in OEM-style Metripack for TPS, Oil & Coolant

The Michigan Motorsports 24" LS 3-wire extension harness gives you a factory-style, plug-and-play way to lengthen TPS, oil pressure, and coolant pressure sensor leads for Gen III/IV LS engines.

When relocating sensors, installing forced-induction hardware, or finishing an LS swap, running stock-length pigtails can force awkward routing, splices, or unreliable aftermarket adapters. This 24-inch harness was engineered to match OEM connectors and wiring standards so you can extend throttle position (TPS), oil, and coolant pressure sensor circuits without cutting factory wires or compromising signal reliability. It’s compatible with common LS platforms including LS1, LSX, LQ4, and LQ9 and pairs well with popular aftermarket sensors such as Holley 554-102.

How does this harness preserve sensor signal accuracy?

The harness uses high-quality conductors and OEM-style Metripack connectors to maintain continuity and shielding similar to factory wiring. That prevents voltage drop, noise, or loose connections that can lead to erratic readings. You’ll retain the original electrical characteristics important for ECU and gauge inputs.

• OEM-style Metripack connectors for secure mating
• Appropriate wire gauge to minimize voltage loss
• Crimped and sealed terminations for stable signals

Will this fit my LS swap or EFI conversion setup?

Yes — the harness was designed to serve common Gen III/IV LS platforms and is especially useful in swaps or custom engine bays. The 24-inch length provides the extra reach needed for relocating sensors, routing around turbo chargepipes, or tucking wiring behind manifolds. No cutting, soldering, or improvised splices are required for correct installations.

• Direct fit for LS1, LSX, LQ4, LQ9 and similar engines
• Extra length for tight or crowded engine compartments
• Plug-and-play installation preserves factory wiring integrity

Is the harness durable enough for high-performance environments?

This extension harness is built with heat-resistant insulation and rugged connectors designed to handle vibration and elevated engine-bay temperatures. The materials resist abrasion and degradation so you won’t need frequent replacements even on track or in forced-induction builds. It’s made to deliver long-term reliability under real-world driving conditions.

• High-temperature rated insulation for engine-bay use
• Vibration-resistant connector design to prevent loosening
• Sealed crimps to keep out moisture and contaminants

Can I use this with Holley pressure sensors like the 554-102?

Yes — the harness was specified to work cleanly with Holley-style pressure transducers such as the 554-102. Mating compatibility ensures you get dependable readings without adapter hassles. Installing with compatible sensors gives a factory-like appearance and consistent performance.

• Confirmed compatibility with Holley 554-102 pressure transducers
• No adapter required when matching connector styles
• Saves installation time and reduces wiring clutter

Who this harness is for: Builders, tuners, and DIY mechanics performing LS swaps, EFI upgrades, or forced-induction installs who want a clean, reliable way to move or lengthen TPS, oil, and coolant pressure sensor leads. It suits anyone aiming to avoid cutting factory wiring, simplify routing in crowded engine bays, or ensure consistent sensor performance with Holley and other compatible transducers. If you need OEM-style connections, heat-resistant wiring, and a 24-inch reach for Gen III/IV LS applications, this Michigan Motorsports extension harness is a practical, long-lasting solution.