Product Description
Holley 558-416 MAP Sensor Adapter Harness
Adapts LS1/LS2 & Early LS Truck MAP Sensor Harnesses to LS3/LS9/Late LS Truck MAP Sensors
Convert your LS MAP sensor wiring cleanly with the Holley 558-416 MAP Sensor Adapter Harness. This adapter is designed to connect LS1, LS2, and early LS truck style MAP sensor harnesses to LS3, LS9, and late LS truck MAP sensors. Holley EFI LS main harnesses are commonly built with an LS1/LS2 style MAP sensor connector, and this adapter allows that harness to work with the later LS3/LS9 style MAP sensor without cutting, splicing, or modifying the main wiring harness. It is also a great solution for LS Hi-Ram intake manifolds and other aftermarket intake setups that require an LS3-style MAP sensor.
Key Features & Benefits
- LS1/LS2 to LS3/LS9 MAP Adapter: Designed to adapt any LS harness using an LS1 or LS2 style MAP sensor connection to a later LS3 or LS9 MAP sensor. This solves the common connector mismatch when changing intake manifolds, MAP sensor styles, or EFI harness configurations.
- Ideal for Holley EFI LS Harnesses: Holley EFI LS main harnesses are commonly designed around the LS1/LS2 MAP sensor connector. The 558-416 adapter gives builders a clean way to use an LS3/LS9 style MAP sensor with those harnesses while maintaining a professional plug-in connection.
- No Cutting or Splicing Required: This adapter harness installs between the existing MAP sensor harness connector and the LS3/LS9 style MAP sensor. It keeps the main harness intact, reduces wiring guesswork, and makes the setup easier to service or change later.
- Great for LS Hi-Ram & Intake Swaps: Perfect for LS Hi-Ram intake manifolds and other aftermarket intake manifolds that require an LS3-style MAP sensor. This adapter helps simplify the wiring side of intake upgrades, engine swaps, and performance EFI conversions.
- Clean MAP Sensor Signal Connection: A proper MAP sensor connection is critical for accurate load calculation, fueling, drivability, and tuning. Using the correct adapter harness helps maintain reliable signal integrity without adding homemade splice points into the sensor circuit.
Notes
- Brand: Holley
- Part Number: 558-416
- Harness Side: LS1/LS2 and early LS truck style MAP sensor harness connector.
- Sensor Side: LS3/LS9 and late LS truck style MAP sensor connector.
- Recommended Use: Holley EFI LS harnesses, LS Hi-Ram intake manifolds, aftermarket intake manifold swaps, MAP sensor conversions, and LS engine swap wiring.
Key Fitments
- LS1 MAP sensor harness applications converting to LS3 MAP sensor
- LS1 MAP sensor harness applications converting to LS9 MAP sensor
- LS2 MAP sensor harness applications converting to LS3 MAP sensor
- LS2 MAP sensor harness applications converting to LS9 MAP sensor
- Early LS truck MAP sensor harness applications converting to late LS truck MAP sensor
- Holley EFI LS main harness applications using LS3/LS9 style MAP sensors
- LS Hi-Ram intake manifold MAP sensor applications
- Aftermarket LS intake manifold applications requiring an LS3-style MAP sensor
- Fitment note: Designed to adapt LS1/LS2 and early LS truck MAP sensor harness connections to LS3/LS9 and late LS truck MAP sensors.
