Hi Ondie,
How did you go with your gauges? I went through the same process early last year. I found it near on impossible to find a gauge/backing plate setup that let you use a single DIN, without cutting into the plastic. Nearly impossible...
I found this website in the states:
http://www.cubbypods.com/#!product/prd1/3642113091/dinpod-45mm-triple It's for the Subaru but the 45mm version fits the SW20 single DIN. For the gauges, I used Prosport. I suggest just google "Prosport 45mm gauge". Ebay has a bigger variety than the official website in the UK (not sure if they are knock off's, but they've work'd fine for me).
As you can see, not a complete disaster and no holes cut into the plastic. The night colour is not too bright.
Cheers
Col