After a few months of trial and error, my son and I have put together a quad gauge prototype that we're happy with. Our goal was to build something using as many of the stock gauge parts as possible and that looks like it belongs in the car. The biggest challenge was making a face with the radius around the openings to match the other combo gauges.
All the face parts are CNC machined from aluminum. There is a fair amount of fit and finish and labor to put these together but I'm sure we can make them for much less than the usual shops. Most of the ones I've seen have a flat face, without the radius around the openings. Each one needs to be custom made so there are no plans to pre-make these for sale. However, we do plan to offer them to Pelican members.
They can be made with almost any 4 gauges or warning lights you want. They won't be cheap because they require at least 2 donor gauges to get the movements and needles. I can't really post a price since there are a bunch of variables but our plan is to make them to order for a reasonable price.
Here is a link to a simple Google Form I put together so I can get a list of those interested and what everyone is looking for. If you're interested in a quad or triple gauge please fill out the form and I'll get back to you with any questions.
https://docs.google.com/forms/d/e/1FAIpQLSeKfN5oK1IoIvy0WaOXr-1M5Lc2QwozaCwlsiEG32Vy50CN7A/viewform?usp=sf_link