It wouldn't necessarily have to involve any of these. Most of these that I've seen have been cobbled together through Excel, so they have the skills to get everything into Excel. You could offer a product that made really pretty charts around these metrics.
The hardware would be just a 720p TV which they would have to buy and mount - you would just sell teh software.
What companies? I did a search for "LCD Marketing Dashboard" and didn't come up with anything. Not doubting you, just curious what these would be called!
The hardware would be just a 720p TV which they would have to buy and mount - you would just sell teh software.