Desperately Seeking Boost

Apparently, 50% of all my posts this year must be about my new car, so here's another one. This one has a twist, however: I'm asking for suggestions.

I'd like to install a boost gauge in the car, not just because it's cool, but because it would help me both to drive and to diagnose problems with the vehicle. In particular, the Mazdaspeed Miata sometimes suffers from a leaky bypass valve, which can result in decreased compression. I'd like to be able to tell if I'm getting the 8-or-so PSI of boost that Mazda designed into the car, or if I need to replace my valve. I might also want to add other gauges in the future: a voltmeter would be useful, as would an oil-temperature gauge. Shoot, if I went to an aftermarket ECU, I'd probably want a wideband air/fuel-ratio gauge, too.

The trouble is, there are numerous places to put the gauge, but each location has significant drawbacks. Below is photo of Mia's dashboard, with potential gauge-mounting locations marked:

1. It turns out that the "eyeball" vents of the first- and second-generation "Miatae" are a perfect fit for the smallest commonly available gauge size, 52 mm. So, I could mount up to 3 gauges in easy-to-read spots, indicated by the 1A, 1B, and 1C in the pic. One advantage to this location is that I wouldn't have to purchase any kind of mount(s), so my only expense would be the gauge(s). Another advantage is that the installation looks pretty clean. I could easily put a boost gauge in 1B and a voltmeter in 1C, and the setup would almost look factory. I also wouldn't have to cut any holes to run the leads; I can just route them through the vent ducts. That means that I could undo the installation without leaving any unsightly evidence. The downside, of course, is that the vent ceases to exist when you plug it with a gauge. I'd also worry about overheating the gauges when running the heater.
2. I could purchase something called the ePod, which would allow me to mount 1 gauge on the steering column just in front of the instrument binnacle, as indicated by the 2 in the photograph. The upside to this location is that it makes the gauge easy to see. Also, since the ePod replaces an existing plate on the steering column, I wouldn't be required to cut any holes to run the leads; I could simply replace the OEM plate if I ever wanted to remove the gauge. The downside is that the gauge would block my view of the odometer and several warning lights. There's also a somewhat cheaper mount from SpeedHut that would do something similar, and would probably hold the gauge better, but it would require drilling a hole in the OEM plate. Of course, that plate could be replaced if need be...
   
3. I could buy a 1- or 2-gauge pod that mounts on the driver's-side A pillar. The pod would let me put 52-mm gauges at locations indicated by the 3A and 3B. This location has the advantage that it interferes not at all with the functions of the other interior components. The main downside is that I'd have to ream holes in the A-pillar cover to route the leads and to bolt the pod in place. Even if I I wanted to use some cheesy, flimsy fasting technology like Velcro or 2-sided tape to attach the pod, I'd still need to run the wiring. Additionally, A-pillar gauge pods scream "ricer," which is not the look I'm going for.
4. Several companies make 1-DIN panels for the radio/climate-control panel; the plates are holed to allow mounting up to 3 52-mm gauges. So I could put gauges where the non-too-visible 4A, 4B, and 4C are in the photo. At least 1 such panel angles the gauges toward the driver, which is certainly nice. The main downside is that I'd have to replace my schmancy Bose 6-disc-changing head unit with something 1-DIN-sized. Also, since the speakers are low-impedence models that work best with Bose head units, I might have to replace them, too. That's stating to sound very expensive, and I haven't even included the cost of the gauges. Additionally, the OEM head unit has the same matte-silver painted finish that the climate controls, door handles, and vent bezels have, and I'd rather not mess with the matching.
5. What, 5? There's no 5 in the picture! That's the idea. I could also mount the boost gauge in the glove box, on the right hand side, pointed toward the driver. That way, I could use it for diagnosis---just open the glove box when working on the car---but not for driving. The advantage here is that the dash would look entirely factory and I wouldn't loose any functionality. The downside, aside from not being able to see the gauge, is that I wouldn't have a cool boost gauge in my cockpit. Sad.
   

So, I have plenty of options, it seems. But I'm not entirely happy with any of them. Your thoughts?