Anybody done any wild dash/instrument customization?

Getting ready (finally) to start the build on my '64 Dart Wagon.
It's not going to be a restoration, so I'm looking at it as pretty close to a blank sheet (except for the primary gauges - speedo/blinker/oil pressure light and gas/temp/charge gauges...kinda want to keep that look the same).

Sitting in the driver's seat trying to figure out where to put the tach, etc.

Since it's a manual transmission car, I've got the area where the pushbutton tranny controls go that could house a 2 1/2" or 3" gauge. Seems like a radio-delete panel could house a trio of smaller gauges.

Anybody done anything cool/unique/different you want to share?
If so, please put some pics up.

Thanks!