Turbo 383 in a A-body Barracuda
If you want sleeper location on the gauges, do this. Reinforce your sunvisor and put a glasses case clipped to the other side or however you wanna do it. Mount the gauges on the sunvisor with the glasses case providing the depth and run the wires back through the sunvisor to along the headliner and down the a-pillar. Viola. Flip down gauges.