Looking at space to add gauges.

SW20??
That space is 2 Din units or double DIN
https://en.wikipedia.org/wiki/ISO_7736
 
It is possible to fit a 'one DIN triple gauge panel' on top and a radio cd player in the space below, but I put the radio on the bottom
Check eBay. 
 

So I've finally been able to get the photos off my phone to upload here. This is the plate me and my dad made at work a few weeks back, The open spot is where i'll be putting my pyrometer gauge. The toggle switches and the "On/Off" switch are yet to find a use but thought id add them in case I wanted something rather than having to modify the plate. Also excuse the bad carbon wrapping, will fix later on.
 

Yeah I might move the stereo to the glove box, usually only use my phone for music for Bluetooth stereo should be fine for that.

Perhaps but i survived january here in wa with a car without aircon or even a working fan

Really great thread. I want to be able to have an Electronic Boost Controller and Wideband gauge set up somewhere but I don't want to loose my double DIN GPS or my vents. I was thinking perhaps where the cigarette lighter go's but then there is the issue of not being able to quickly glance at it because its behind the steering wheel. I think pillar guage might be ideal but the boost controller I want is rectangular and wouldn't work. Also pillar gauge is defect central. Maybe I might mount mine in the roof? Thoughts?

Another thought is sacrificing the ash tray. We have that small compartment above the centre console anyway: 

Like many others, I found the center console area the best location for visibility.
Also, mountings that angle them slightly towards the driver make the gauges easier to read, by cutting down parallax error. 
 
I set up mine just below the center vents, and above the CD player rather than below, so as to keep them reasonably high.
Although it took a bit of work, I made the pod out of plumbing sockets glued together to take stock 50 mm gauges, but the center surround did need slight modification. 
One thing to check when mounting them in this location is reflection from the rear window making them hard to read during daylight.
I found that tilting them upwards slightly eliminated this. 

The ashtray switches are for aerial up down, and daytime running lights with leds to indicate whether they are on or off.
 
I have a fairly large separate GPS mounted on a separate bracket to the left of the gearlever.
Not quite a double din but it does the job, and is possibly easier to programme than a dash mounted one.
 
I just found a pic.