Autometer 3-3/8 Sport-Comp 12

Upgrade Your Air-Cooled Cockpit with the AutoMeter Sport-Comp Mechanical Speedometer

When it comes to the iconic look of a high-performance air-cooled Volkswagen, nothing sets the tone quite like a set of AutoMeter Sport-Comp gauges mounted in the dash. The AutoMeter 3-3/8 inch Sport-Comp Mechanical Speedometer (ATM3992) is the gold standard for enthusiasts who demand precision, durability, and that classic competition aesthetic. Whether you are building a traditional Cal-Look Beetle, a rugged Baja Bug, or a street-shredding Karmann Ghia, this speedometer provides a crisp, easy-to-read display that handles the vibrations and harsh environments of a rear-engine layout with ease. The signature black face, white accents, and fiery red pointer offer a timeless high-contrast look that ensures you can monitor your velocity at a glance, whether you are cruising the strip at midnight or blasting through the dunes under the midday sun.

Engineering excellence is at the heart of the Sport-Comp series, and this 120 MPH mechanical unit is no exception. Designed for serious builders, it features a resettable trip odometer that is essential for tracking fuel stops on long vintage rallies or monitoring maintenance intervals on your freshly built stroker engine. The mechanical movement provides a direct, analog connection to your drivetrain, offering a smooth needle sweep that electronic gauges often struggle to replicate. While this unit is housed in a standard 3-3/8 inch (85.7mm) casing that fits perfectly into most aftermarket VW dash pods and modified factory dashboards, it is built with the ruggedness required for racing applications. By choosing AutoMeter, you are investing in a piece of American-made performance history that has been the top choice for professional racers and custom builders for decades.

Compatible Models and Fitment Applications

While this is a universal performance gauge, it is a staple in the VW community. Please note that custom mounting or a 3-3/8 inch gauge pod is required for factory dashboard integration. Fitment includes:

• Volkswagen Type 1: Beetle and Super Beetle (Custom dash or gauge pod required).
• Volkswagen Type 2: Bus, Transporter, and Kombi (Ideal for custom overhead or center consoles).
• Volkswagen Type 3: Fastback, Squareback, and Notchback.
• Volkswagen Type 14: Karmann Ghia (Fits many aftermarket dash layouts).
• Volkswagen Type 181: The Thing (Perfect for rugged, open-air cockpit builds).
• Kit Cars & Custom Builds: Meyers Manx, Sand Rails, Dune Buggies, and Bradley GTs.

Technical Specifications and Dimensions

• Product Model: AutoMeter 3992 (Sport-Comp Series).
• Gauge Diameter: 3-3/8 inches (85.7mm).
• Speed Range: 0 to 120 MPH.
• Input Type: Mechanical.
• Cable Connection: 5/8 inch - 18 threaded cable input.
• Drive Type: .104 inch square drive.
• Odometer: Integrated 6-digit main odometer with a resettable trip odometer.
• Bezel Finish: Brushed Silver/Aluminum.
• Face Color: Professional Black with White increments.
• Pointer: High-visibility Red.
• Lighting: Perimeter incandescent lighting (Includes Green and Red bulb covers).

Expert Pro Tips from Appletree Automotive

Pro Tip 1: The Speedometer Cable Workaround. It is crucial to understand that the ATM3992 will NOT work with a stock Volkswagen speedometer cable. The VW uses a unique clip-on or small-threaded fitting at the speedometer head, whereas this AutoMeter unit requires a heavy-duty 5/8 inch - 18 threaded input with a .104 inch square drive. To install this in your Bug or Bus, you must purchase a custom speedometer cable that features the VW spindle-end at the wheel and the AutoMeter-style thread at the gauge. Don''t attempt to force the stock cable, as you will strip the threads and potentially damage the internal mechanism of your new gauge.

Pro Tip 2: Perfecting Your Night Visibility. The Sport-Comp series comes standard with incandescent bulbs and colored "boots" (red and green) to change the backlighting. For the best experience in an air-cooled VW, we recommend upgrading to a high-output LED bulb. Since VW electrical systems can sometimes have voltage fluctuations, an LED provides a steady, bright light that makes the black face pop at night. Also, ensure your gauge is properly grounded to the chassis; many VW dash pods are plastic or fiberglass, and without a dedicated ground wire to the gauge housing, your lighting and needle accuracy may suffer.

Pro Tip 3: Calibration and Tire Size Considerations. Because this is a mechanical speedometer, its accuracy is directly tied to your tire diameter and the gear ratio in your transmission. If you are running oversized "Big & Little" tires on a Cal-Look car or massive paddles on a sand rail, your speedometer reading will be off. Always verify your speed using a GPS app after installation. If the reading is significantly off, you may need a ratio adapter (small gear box) installed inline with your speedometer cable to correct the output. This ensures that your odometer stays accurate and you stay within the legal speed limits on the street.