Im just wondering if anybody has had an issue with the speedo shittin itself at the gearbox end? I have an 87 D21 2.7 5Speed and the fella I got it off reckoned the speedo cable had busted so I got a replacement,hooked it up (proper) and still no go.I pulled the dash out and went for a drive and the cable wasnt even moving

Both cables seem to be fine but im wondering about the bit the cable screws onto on the gearbox? is it a simple matter of unbolt and replace?
Cheers.