The whole purpose of the onboard PC is so that you can do your vision processing (grip, openCV, take your pick) without the latency and issues with the FMS. With having the onboard PC and doing GRIP on your driver station you have the disadvantages to both without any advantages other than offloading from the roboRIO. Either you can run GRIP on that on board PC or just skip the on board PC and stream directly to the driver station. If you're going to the effort of the PC, that's the much preferable situation. I'm going to assume you're doing that for the rest of this explanation.
Again, edit once I realized I was wrong and misunderstood you. The two tutorials below have instructions on how to set it up, and you can just use the same IP listed in the tutorials to be on your smart dashboard. There are lots of examples of how to display MJEG streamer, the simplest just being a browser window.
I wrote an entire two page simple tutorial, realized I was wrong, then realized GRIP had a much better tutorial here:
https://github.com/WPIRoboticsProjec...Raspberry-Pi-2
It says Raspberry Pi 2, but most of these will have the exact same instuctions (minus a few things that we can help with). There's also this tutorial on the official FRC documentation that is PC based instead of Pi based:
https://s3.amazonaws.com/screensteps...pdf?1482933081
If you need any further help, feel free to respond.