You can run DashBoard on one computer and then connect it to an XPression machine across an IP network, absolutely.
1: In DashBoard:
-In edit mode for your custom panel, look at the top level item in the Custom Panel tree you want to connect.
(The tree is on the left hand side of the edit mode view)
It will have an item called 'XPression DashBoard Linq port' (which will be set to 2222, and a checkbox called 'Enable Streaming', set that to on.
2: DataLinq server
-Add a new Data source by clicking the 'Add New' button in the DataLinq Server UI.
Choose 'DashBoard DataLinq Source' and under 'Host' type in the IP address of the DashBoard computer
3: Make sure that your DataLinq server is actually attached inside of XPression
Project->DataLinq Manager
Or CTRL-ALT-M
#XPression