Yeah, I'm an analog gauge guy myself, and none of the smartphone apps have a good gauge display, in my opinion.
Which is another reason I like the Garmin solution. Not sure why they discontinued it, although it still seems to be available in other countries. On top of that, one thing in favor of the Garmin and the smartphone apps is that the OBD data can be used for fuel consumption calcs and costs, and some have basic code reading and clearing.
I do seem to remember seeing a gauge pod for the driver pillar for a Sprinter, and since Westys don't have a rear view mirror, the space where the mirror would go is another prime area for a gauge pod.