Overview
GM Gen 3 and Gen 4 LS engines make big power thanks to deep OEM and aftermarket support. Many parts interchange, but small differences (24x vs 58x, VVT, injector type, etc.) matter. Start by confirming exactly which LS you have, then pick the right MS3Pro plug‑and‑play path below.
LS engine identification
Use this to confirm Gen 3 (24x) vs Gen 4 (58x), VVT, and other key features before ordering.
Link: LS Engine Identification Guide
Two proven plug‑and‑play paths from AMP EFI (Chevrolet/GM LS)
AMP EFI offers complete drop‑on harness solutions for MS3Pro EVO and MS3Pro ULTIMATE ECUs for GM LS Gen 3 (24x) and Gen 4 (58x). Both control factory VVT on equipped Gen 4 engines and can optionally control 4L60E/4L80E transmissions (if you’re not running a Powerglide).
Chevrolet/GM Gen 3 & Gen 4 plug‑and‑play options
Harness and wiring details (built for Chevrolet/GM LS swaps)
• TechFlex‑sleeved, self‑extinguishing loom with high‑temp TXL/GXL automotive wire
• OEM‑grade Delphi & TE connectors throughout
• 4‑gauge power and 10‑gauge ground to reach trunk‑ or under‑hood batteries
• Single waterproof fusebox houses all relays and fuses
• Fuel‑pump circuit sized for serious power: 10‑gauge wire, 30‑amp fuse—enough for pumps that support ~1000 whp out of the box
• Designed with room to grow: spare I/O for future upgrades
Warranty
MS3Pro EVO and MS3Pro ULTIMATE ECUs carry a Lifetime Warranty for the original purchaser.
Quick start guides (Gen 3 & Gen 4 LS PNP)
• EVO+ LS 24x Quick Start Guide [PDF]
• EVO+ LS 58x Quick Start Guide [PDF]
Latest software, firmware, and documentation
Get the newest manuals, TunerStudio project files, and firmware here:
Link: Downloads