What's the best way to replace the Cluster Voltage regulator?

OK, tested power to pin #1 disconnected from cluster got 12V. Plugged back into cluster turned key on fuse blew. Removed connector and retested no voltage. So problem is in cluster.

Replaced fuse and disconnected head lamp switch, turned on key fuse blew. So problem is not headlamp switch.

Checked resistance on fuel guage 15 ohms. Did D cell test on gas guage and it did not move. So gas guage is bad.

Checked resistance on temp guage infinite. So temp guage is bad also.

My guess is one of these guages has an internal short causing the fuse to blow. Pulled both gauges to bypass still blowing fuse....ugh

Pulled all light bulbs still blowing fuse.

Anyone have any ideas? Would really appeciate some advice. Thanks, Matt