1:7 Mechanical Tacho RPM - Black. With 12-Volt lighting.

Diameter: 60 mm

For Honda CB500 & CB750  

Note: 

1:4
Suitable for almost every Honda / Suzuki.

1:5

Suitable for any Kawasaki / Yamaha with a mechanical tachometer.

1:7
This is an exception, as it is suitable for any Honda CB500 - 750.