Sniper EFI 3.5 Touch Screen LCD Controller

The Holley Sniper EFI 3.5 Touch Screen LCD Controller is a dedicated engine management system designed for carbureted-to-fuel-injection conversions and modern EFI builds. Whether you're restoring a classic muscle car, building a restomod, or retrofitting an older platform with contemporary fuel delivery, this unit replaces traditional carburetor tuning complexity with digital precision. The 3.5-inch touchscreen interface puts real-time engine data and adjustment capabilities directly at your fingertips, eliminating the need for external laptops or bench-tuning software during development and troubleshooting on the dyno or street.

This controller handles fuel delivery, ignition timing, and idle stability through an integrated digital display and intuitive menu structure that responds to real-world operating conditions—cold starts, cruise, wide-open throttle, and transient throttle events. The compact form factor (6.5 x 3.25 x 6.55 inches, weighing just 0.65 lbs) makes dash, column, or under-seat mounting practical in tight engine bays, while the touchscreen eliminates the need for mechanical vacuum lines or carburetor linkage recalibration. Holley's tuning software ecosystem supports custom fuel tables, timing curves, and boost compensation, allowing you to dial in efficiency, power output, and drivability to match your specific cam profile, cylinder heads, and fuel octane rating.

This controller is ideal for street rods, restorations, LS swaps, carbureted engine updates, and custom builds where traditional carburetor tuning proves impractical or insufficient. Installation requires compatible fuel injectors, a returnless or return-style fuel system, and proper wiring harness integration, but the plug-and-play nature of modern Holley EFI systems reduces labor compared to full custom standalone systems. Serious DIY mechanics and professional shops alike leverage the Sniper EFI 3.5 to unlock repeatable, data-driven tuning—critical when chasing consistent horsepower, fuel economy, and cold-weather reliability across varying elevations and ambient conditions.