With so many people that have white face or some aftermarket gauge faces, I'm guessing it can't be too hard, but how is it done? I'm wanting to put some gauges in my del sol but I want to make sure they are calibrated correctly. Thanks for the help

 

You dont mess with the needles. The white face/indiglo whatevers slide on so theres no calibrating involved.

 

If you go to a Dyno you can get a speed reading done to see if your speedo is out (ie Indicated speed vs actual speed).

Calibrating something as coomplex as a speedo would, in all probablity, be a real **** of a job. Unless you had all the equipment, and knew exactly what you were doing.