16 Pulse Transmission Signal Generator

The Classic Instruments 16 Pulse Transmission Signal Generator (SN16) is a Hall Effect speedometer sending unit designed to convert mechanical transmission input into precise electronic pulses for modern digital speedometer clusters. This adapter bridges the gap between vintage mechanical speedometer cables and contemporary electronic gauge systems, making it an essential component for classic car restorations and performance vehicle modifications that require accurate speed readout without sacrificing originality.

Operating at 16 pulses per revolution, the SN16 delivers the signal frequency necessary for most aftermarket digital instrument clusters to calculate and display vehicle speed with reliability. The Hall Effect sensing technology eliminates the need for mechanical contact points, providing consistent performance across varying engine loads and ambient conditions. Compatible with GM, Ford, and Chrysler transmission housings, this sending unit integrates into existing speedometer cable routing without major drivetrain modification. The compact form factor—measuring 3.25 x 2.5 x 6 inches and weighing just 0.57 lbs—allows for discreet installation in factory locations while maintaining clean engine bay aesthetics.

Builders and enthusiasts tackling restorations of domestic muscle cars, daily-driven classics, and custom hot rods rely on pulse generators like the SN16 when swapping modern dashboard electronics into older vehicles. Whether upgrading from a cable-driven mechanical gauge to a programmable digital cluster or integrating GPS-based speedometer systems, accurate pulse input is critical for proper system calibration and real-time speed display. The 16-pulse format remains the standard in the restoration and custom gauge industry, making the Classic Instruments SN16 a trusted reference component for shops and individual builders.