Now that you've had a glimpse of the future for your dash it's time to get back to work.
Take everything out and put all the gauges back in the boxes except one of each size along with one bracket for each that holds the gauge in place and 2 nuts, no need for lockwashers. Take the original facia and bezel off. Use some wax and grease remover to clean the original bezel in the area surrounding the vent hole then paint it flat black. You only need to do the area around the vent because the rest will be hidden but if the vent area is left shiny or wood tone you'll be able to see it after the panel is inserted into the dash.
