calibrating speedo
how hard is it to calibrate the speedo, i went form 3.42 to 4.11 and when the speedo says 90 im going 75, wouldn't be a big prob but i just put 100 fake miles on the car lol
would i be able to do this myself? or would i be able to take it to a dealership and have them change it without effecting my tune? anyone know what they'd charge?
posted this in the diagnostic and external section but didnt get any feedback






