MS3Pro ULTIMATE Black Center Harness

Unlock expanded I/O for your MS3Pro ULTIMATE ECU. The MS3Pro ULTIMATE Black Center Harness is an 8-foot flying lead harness designed specifically for the third (black) AMPSEAL connector on the MS3Pro ULTIMATE ECU. This harness expands your available I/O by nearly 50%, enabling advanced functionality such as boost control, VVT, traction control, flex fuel, table switching, and more. The harness features a pre-crimped, sealed 23-pin AMPSEAL connector and is constructed using automotive-grade, high-temperature wire for durability in harsh environments. Each wire is color-coded and printed with its signal name to simplify installation, reduce errors, and support clean, professional wiring layouts. Perfect for: Custom engine swaps Standalone ECU projects Race car rewiring Retrofit EFI conversions Key Features: 8′ flying lead harness for MS3Pro ULTIMATE’s black center connector 23-pin AMPSEAL connector (pre-installed and sealed) Color-coded, printed wire labels for easy identification High-temp automotive-grade wire for long-term durability Supports advanced features like VVT, traction control, and flex fuel Designed for clean installs, upgrades, and system expansions Note: This listing includes the center harness only. It is ideal for users who already have the main harness and want to unlock additional I/O on the MS3Pro ULTIMATE ECU.