I replaced my cable, VSS, and had my speedo rebuilt by a vintage speedo and guage pro, and still have a bouncing cable. I’ve learned to live with it. I got tires of tearing apart my guage cluster. I was worried I was going to break either my cluster or dash components for how many times I had it out. My cable flows nice and smooth up from the trans, no sharp bends, and snaps easily into the back of the speedo. I think it’s the speedo head it self. If anyone has any suggestions on this I’m open to new ideas. I created a thread about this a while back as well Hudson.