Radio plate replacement is a nod to some of the factory GT cars that did that. Many moons ago I had one when I had a running -4. That coming from the guy that sold the 904 gauge kits.
Now I am going back to a 904, for my -6, the EG swap car gets a quad from Speedhut I had plans to do a quad using a 924 combo gauge and VDO internals, but it became a time versus results thing.
I also thought about running a 930 tach, and doing the same thing and using a 904 in the EG swap. I even asked Speedhut to place a boost gauge into one of their tachs. No can do
as I am in the market for one