System Console Dashboard examples?

You shouldn't have to close SC and re-open it (maybe it won't cope with some changes if you've reprogrammed the FPGA with something different but if the hardware is the same you should be able to keep using it over and over again)

Can you post a code fragment and tell me what error you're getting from it?

I'm assuming you want to read the values regularly and update the display as the values in the board change. The callback is there because the monitor service will read your values every second and call your code so you can display them (doing it this way gets you accurate timing which the standard alarm procedure doesn't. It also gets you better bandwidth utilisation).