This is a Venom Racing VSM Speed Meter. This is very versatile for easy mounting and installation.  This will tell you the top speed your vehicle reaches.  These are a great addition, and can be used to tune your vehicle for peak performance.

Features
Easy to install and calibrate
Top speed function will show top speed reached on the track
Lifetime motor odometer
Race trip odometer
Built-in digital voltmeter
Selectable between MPH/KPH

Includes
One Speed Meter with sensor

Requires
Installation onto vehicle

Specifications
Length:   10.5mm   (.41")
Width:    45.8mm  (1.80")
Height:   25.0mm   (.98")