Autometer 2-5/8 Sport-Comp Si

OVERVIEW

When it comes to monitoring the heart of your air-cooled beast, nothing beats the precision and heritage of AutoMeter. The Sport-Comp Silver (Si) series brings that iconic pro-racing aesthetic directly into the cockpit of your Volkswagen without breaking the bank. For decades, VW enthusiasts have relied on AutoMeter to provide accurate RPM readings that are essential for protecting high-performance builds from over-revving and catastrophic failure. Whether you are running a mild 1600cc street engine or a high-compression 2332cc stroker, this 2-5/8 inch tachometer provides the split-second feedback you need to nail every shift. The silver face offers a modern, high-tech look that contrasts perfectly with the classic black bezels found in vintage interiors, making it a standout upgrade for any Type 1, Type 2, or Type 3 project.

The "Si" designation signifies the marriage of the legendary Ultra-Lite appearance with the rugged reliability of the Sport-Comp line. This specific 2-5/8 inch model is designed to survive the harsh vibrations and thermal fluctuations common in air-cooled engine bays and stripped-down dune buggies. Featuring a high-contrast orange needle and crisp black increments, the gauge ensures maximum legibility even during high-speed maneuvers or nighttime cruising. It isn''t just about looks; the internal air-core movement is engineered for rapid response and pinpoint accuracy. By choosing this AutoMeter unit, you are investing in a piece of equipment that bridges the gap between show-car style and track-day functionality, ensuring your VW stays within its power band while looking like a professional competition machine.

FITMENT

This universal high-performance tachometer is compatible with 4-cylinder air-cooled Volkswagen engines and a wide variety of other applications. Specific VW fitment includes:

• Volkswagen Beetle: 1946-1977 (Standard and Super Beetle)
• Volkswagen Karmann Ghia: 1955-1974
• Volkswagen Bus / Transporter: 1950-1979 (Type 2 Split Window and Bay Window)
• Volkswagen Type 3: 1961-1973 (Fastback, Squareback, Notchback)
• Volkswagen Thing: 1973-1974 (Type 181)
• Custom Applications: Dune Buggies, Sand Rails, Manx-style bodies, and Trikes using VW drivetrains.

SPECS

The AutoMeter ATM3707 is built to professional standards with the following technical specifications:

• Gauge Diameter: 2-5/8 Inches (66.7mm)
• RPM Range: 0 - 10,000 RPM
• Face Color: Silver (Si Series)
• Bezel Color: Black
• Pointer Color: High-Contrast Fluorescent Orange
• Movement Type: Air-Core (Electric)
• Lighting: Perimeter Incandescent (Includes red and green bulb covers)
• Signal Compatibility: Works with 4, 6, and 8 cylinder engines with points, electronic ignitions, and most 12V high-performance racing ignitions.
• Voltage: 12 Volt DC negative ground systems.

PRO TIPS

1. Clean Signal Source is Key

To ensure your AutoMeter tachometer provides a rock-steady needle, you must source a clean RPM signal. On most air-cooled Volkswagens, this is achieved by connecting the green signal wire to the negative (-) terminal of the ignition coil. However, if you are running a high-output CDI ignition box, such as an MSD 6AL, you MUST connect the green wire to the dedicated "Tach Output" port on the ignition box rather than the coil. Connecting directly to the coil on a CDI system can result in erratic readings or even damage to the gauge''s internal circuitry. Always use high-quality 18-gauge wire and ensure your connections are soldered and heat-shrunk for maximum longevity in the vibrating environment of a VW engine.

2. Master the Grounding Circuit

Old Volkswagens are notorious for poor grounding due to decades of corrosion and paint buildup. Since this is an electric air-core gauge, it requires a solid, dedicated ground to function accurately. Do not simply "daisy chain" the ground wire to a random screw under the dash. Instead, run a dedicated ground wire from the gauge to a clean spot on the chassis or, better yet, directly to the battery negative or a central ground bus. If your needle "bounces" or drops out when you turn on your headlights, it is almost certainly a grounding issue. Taking the time to establish a clean ground will ensure your RPM data is precise when you are pushing your engine to the limit.

3. Strategic Mounting for Visibility

The 2-5/8 inch size is the "goldilocks" of gaugeslarger than standard 2-1/16 inch gauges but more compact than a 5-inch monster tach. For the best ergonomics in a Beetle or Ghia, many builders prefer