I would like the Blitz DIN gauge panel that you can put under your deck. It retails for about $30.00 from places like Summit. Anyways I think it would make a nice clean instal for my Temp gauge, Profec B and Turbo Timer. How hard would it to modify it to fit these? I think the greddy products are slightly bigger than the Blitz ones so I will have to use a dremel or something to enlarge everything. Anyone ever do this?

 

I did. Here's the writeup: http://www.geocities.com/nathan356/mycargauges.html.
As you'll read, there is a much better solution if you're using round gauges. I don't have the part # offhand, but if you search for SAAB in this room, there was recently a thread on it. Note that the Blitz may not have the same problem as the HKS did with fitment, although they are very, very similar. In any case, you can make it fit, it just wasn't worth it for me since I had round gauges.