Hey, just wondering if anyone has seen this before or knows what causes it as my Speedo it’s just jumping up and down without moving. I pulled the cluster, the solder joints look fine.

Try unplugging the speedo sensor and see what it does.

It's on the driver's side at the back of the 2wd transmission, or output of the transfer case if 4wd.

Are any other gauges or idiot lights acting up or just the speedo? The two connectors on the back of the cluster are notorious for not mating up 100%, so that was my original thought. As mentioned above, if it's just the speedo, it could be the input sensor.