I have an 09 automatic ss and I recently tuned my car to the gm stage 1. My speedometer has been out ever since and just changed the speed sensor and it didn’t work, does anybody have a clue on what else it could be ?

 

You know that the speed is calculated by the computer that you just reprogrammed? Why blame the innocent sensors?

 

Agree, whoever installed the tune/MAP sensors needs to have another look at it. You didn't pay that money for this to happen.