Speedometer allows for several levels of customization.
It comes with default black numbers on white, but we have a host of number styles for download. The script also allows you to define your own custom numbers. As a safety precaution, you define the URLs from which the counter can be called. This script also allows you to have the counter link to a certain page. The scale is 1 - 10, with 1 being poor and 10 being excellent.