I created these designs on Adobe Illustrator. The arrows that I included on the first two designs are an indicator as to where the speed level is currently at. Even though the gradient shows a difference in speed, it is not entirely clear to pin-point the exact level of speed.
The speedometer in the purple circle did not have the outcome that I was expecting, as there is no indication that the icon is a speedometer. The 92 MPH icon was created using the line tool and the extrude tool to create the 3D effect . The circular one is also hard to decipher. The white shape was meant to be a reflection but makes the icon look tackey. Collectivley the designs do not look as professional as I had hoped for.