4453 Speedo With Black Housing 9.000 RPM. The ACE-4453 digital speedometer from Acewell is ADR approved and road legal for passenger vehicles and motorcycles. The ability to flush mount the 4453 makes it very popular for custom bike builders.  

The multi-function LCD displays illuminate via a backlit blue screen displaying both speed and RPM in digital format. It has the ability to store a trip odometer as well as a total odometer. It's 100% waterproof, shock resistant up to 8G's of shock (perfect for these old bikes) and even has a clock! It even has support for factory indicators like blinkers, oil, neutral, etc.