[Fbks_Cruiser]

OP - that is the speedo end of the cable in your picture, not the transmission end correct?

I think Geezer is talking about the trans end.

I am going through a similar thing with mine but have a stock speedo with aftermarket cable from Orielly. Needle jumps and occasional makes chirping sound at the speedometer. I pulled the drive cable from the sheath and lubed it but it made no difference. After searching on the forum I found a thread where a member clipped about 1/4” off of the drive cable and it fixed his problem. I tried that, no more chirp but the needle is still bouncy at some speeds. So I’m still figuring it out. Sorry I don’t know what the correct length from the crimped ferrule to the end of the cable should be.

Also verify the routing of the speedo cable to make sure there are no kinks or sharp bends.

Good luck and let us know what you figure out.