My co-worker told me about these gauges and I finally installed my first one last month. Initially I wanted a more accurate boost gauge but to troubleshoot an O2 sensor CEL I ended up buying a pair of their AFR sensor modules and adding them to my setup as well. I also wanted to be able to use the ODB monitoring functionality as well.
The initial install is very simple. Each sensor module is added via 1/8" stereo extension cables, the same as what would be used to connect an ipod to an aux audio jack. Additional gauges are added at the other end of the chain. My setup has a two multi function gauges with ODB connectivity, two AFR sensor modules and a Boost/Vacuum sensor module. The device chain looks like this:

gauge 1<---->gauge 2<---->afr sensor1<--->afr sensor2<--->boost/vac sensor

I put the sensors in the engine bay in the void under the latch for the deck-lid. The AFR sensors come with their own wideband O2 sensors which I mounted in the rear bungs of my cat-bypass pipes and I tapped the "L" shaped hose on the left side of the Y pipe near the TB for the boost sensor module. The only thing I needed to run through the firewall was the 1/8" stereo extension cable to the ODB modules that drive the gauges under the dash. I then made a custom panel to house a pair of 2 1/16 gauges in the former location of the CD holder tray.

Initial setup was a pretty big PITA because the instructions are a bit nebulous. Eventually I got them configured how I want them on startup and the left gauge watches boost from 0 - 30PSI while I have the right gauge watching 4 parameters simultaneously - afr1, afr2, short term fuel trim bank 0 and st fuel trim bank 1. You can view any number of ODB parameters as well as any sensor modules you add in on either gauge in multiple formats. In the attached photos I'm using the analog gauge mode and line graph mode.
Another great feature is that the gauge can read CEL codes and also reset them...this is very nice to have when you don't feel like hooking up Durametric.
Overall I am very happy with them and have not really scratched the surface of what they can do. You can upload custom gauges from their site or create your own, and you can also upload your own wallpapers.
I am planning on cleaning up the mounting plate when I do a stereo upgrade next month but I went with satin black for now.

 

Where did you get the panel from to mount the guages and did it need to be modified?

 

Very nice man! During the holidays I ordered two DM-6 Gen-3 AFR kits (one for each bank), a vacuum and boost sensor module and the SM-USB adapter so I can log the values. I figured I was the only one thinking that these gauges are pretty awesome. I was thinking of doing the same thing as far as mounting under the radio. I'll need to find a nice panel I can custom fit in there.

 

nice clean setup. i had my gauges down there too, problem is that they are very hard to look at when they are down there and you are at wide open throttle.

 

Cool, looks good. When you fix up the mounting plate you might try painting with plasti-dip. It is easy to get an even coat and it matches the factory black plastic almost perfectly.

 

I made it out of a small sheet of acrylic from Home Depot with my drill and a Dremel.

 

True, but they have a peak and hold feature that helps with this. The line graphing mode also gives you a bit of time to look down at the results once you are able to.
I couldn't think of a better place and since the CD tray is a total waste for me it worked out perfectly.