Just got my 4.10s and the Speedcal installed. While launching and braking, the speedo goes a bit nuts, the needle fluctuates all over the place, as high as 180kph. I'm also not sure how accurate it is, I haven' gotten the chance to really check it on the street yet, I only drove the car for 20 mins or so after getting it back.
Do you think the speedcal itself is bad or is it installed/set up wrong?
Do you think the speedcal itself is bad or is it installed/set up wrong?