i instaled the power fc and a blitz speed meter but both wont display my speed, i cut the wire to reconnect the blitz meter but for nothing i checked the harness to see is the fc socket is loose but all looks fine, please help, and dose the fd use speed to calculate load? because if so thats why i have high knock level? any help would be greatfull

 

Speed is not used to calculate load.

 

If your speedometer still works you still have the input that the Apex'i uses working. It may be open circuit to the PFC.