Not sure if this has been suggested, but would/could support for Pro-Gauge, DLC-247, etc be in the plans?
There is already a small amount of hardware support available in the form of making the tachometer lights of the G27 work, but I don't know what they plan to add in the future. It's really difficult to determine any noticeable go-to single solution with physical dash gauges for computers because the majority of the customer base for said category of computer peripheral is taken up by enthusiasts, who are much smaller in size and a more to-themselves customer base most of the time in general as a result.
