You need to modify the line in your config.yaml file (also make sure it is not commented out) and then restart your node.
console.address: 127.0.0.1:14002
Should be
console.address: :14002
When you make a second node, you will need a brand new identity signed with a new authorization token. It will be a separate instance from your first node. Currently there is no way to combine multiple node dashboards into one. You will need to pick a different console.address port number (e.g. 14003) and view the dashboard separately. There are future plans to provide for multiple nodes on one dashboard.
It is usually better to create a second node instead of adding an additional hard drive to the first node. If one hard drive of the two fails you lose all data on a single node. If you run two nodes on two hard drives, if one fails you still have the other. This spreads the risk of having a hard drive fail.
I have heard good things about @Vadim’s Win GUI Toolbox for running multiple GUI nodes. I have not used it myself though. Good luck!