Topless69GT 28 Report post Posted April 29, 2015 My speedometer was working fine and all of a sudden it starts making noise and jumps from zero to 90MPH and then pegs all the way past 120. I changed out the cable and the new one is doing the same thing. I looked at the gear on the one end and it looks fine. I don't think the speedometer is at fault. How long should the cable be with a 351W/FMX combo? I have two different lengths. One is barely long enough and one has room to spare but both are acting up. Quote Share this post Link to post Share on other sites
Rsmach1 71 Report post Posted April 29, 2015 If it's acting up with both cables it's probably the speedo Quote Share this post Link to post Share on other sites
