Michigan Motorsports LS 3-Wire Extension Harness 24" – TPS & 3-Wire Pressure Sensor Extension, Metripack Fit

Michigan Motorsports 24" LS 3-wire extension harness extends TPS, oil pressure, and coolant pressure sensor connections for Gen III/IV LS engines without cutting or splicing.

This 24-inch extension harness from Michigan Motorsports provides a factory-style solution when you need extra lead length for throttle position sensors (TPS) or 3-wire pressure senders during LS swaps, EFI conversions, or forced-induction installations. Manufactured to match OEM connector fit and wiring configuration, the harness keeps signal integrity while simplifying routing in tight engine bays or when relocating sensors for clearance or packaging reasons.

How will this harness fit my LS engine and sensors?

The harness is built to plug directly into OE-style Metripack connectors used on TPS and many pressure sensors for Gen III/IV LS families like LS1, LQ4, LQ9 and LSX. No rewiring or adapter pigtails are required when matching like-for-like sensors, so install is fast and clean.

• Direct Metripack-compatible ends for TPS and 3-wire pressure senders
• Designed for LS1, LSX, LQ4, LQ9 and similar Gen III/IV platforms
• Perfect mating with Holley 554-102 style stainless pressure transducers
• Maintains correct wire order and signal continuity for ECU-reading accuracy

Will this harness survive heat and vibration under the hood?

Yes — the Michigan Motorsports extension uses heat-resistant insulation and robust connector shells to withstand elevated temperatures and engine bay movement. It keeps contacts secure and prevents premature wear even in forced-induction or high-performance environments.

• Rugged wire jacket resists heat and abrasion
• High-quality pins and sealed connector bodies reduce corrosion risk
• Strain-relieved ends to minimize connector stress under vibration

Can I use this with aftermarket EFI systems or relocated sensors?

This harness is ideal for aftermarket EFI installations and sensor relocation where stock wiring falls short. It preserves factory wiring behavior so aftermarket ECUs and pressure transducers receive correct signals without custom splices.

• Plug-and-play for Holley-style pressure transducers (e.g., 554-102)
• 24" length gives flexibility for turbo, supercharger, or custom packaging
• Avoids cutting OEM harnesses, keeping vehicle resale and wiring integrity intact

How does installation compare to cutting and splicing the factory harness?

Installing this extension is faster, cleaner, and more reliable than hacksaw-and-solder solutions. It eliminates the need to modify factory wiring, reduces risk of wiring faults, and leaves a professional-looking engine bay with OEM-style connectors.

• No crimp, solder, or heat-shrink required for basic installations
• Reversible — remove or re-route sensors without permanently altering OE wiring
• Maintains OEM-grade signal shielding and connector fitment for accuracy

Who is this for? If you're performing an LS swap, upgrading to aftermarket EFI, relocating pressure senders for packaging or clearance, or building a turbo/supercharged LS platform, this Michigan Motorsports 24" 3-wire extension harness saves time and preserves factory-style wiring. It’s designed for builders and technicians who want a dependable, serviceable solution that keeps sensor wiring correct and accessible without cutting into the original harness.