Although I have not yet built my cockpit for the T-28 I have slowly accumulated elements for the build of the cockpit. One of the thing I have created are the panels that adorn the cockpit. These were first made with a CAD program and then converted to JPG files. The best way to use them is to print them and scale them with the printer and not by re-sizing the image. This will preserve the detail. You may use these by right clicking on the image then selecting "save image as"

Please be advised, instrumentation changed dramatically over the service life of the T-28. The panels below were created for actual photos and reference info but may not match a specific aircraft.

The placard on the right is found on the instrument panel (item 3) on the left hand side and indicates if the landing gear is down and locked. It also contains the landing check list.
This placard to the left is located on the right hand side of the instrument panel, it contains the take off check list
The placard to the right is the radio maintenance indicator. It is located at the top of the instrument panel in the center.  
  The panel on the left is located on the right hand console of the cockpit. I have not identified its purpose as yet but I expect the answer soon.
The back panel to the right goes under a rotating knob located on the right hand console (see item 4 in reference photo).  
  The image to the left are just to the left of the panel above on the right hand console and identified as item 3 in the reference photo
The panel on the right is located just aft of the panel above on the right hand console and identified by red circle in reference photo.  
The panel to the right is I believe a communications panel located on the right hand console and identified as item 8 in the reference photo.  
  The panel on the left is also located on the right hand console and is identified as items 13 and 16 in the reference photo.
     
  The panel on the left is located on the right hand console just to the right of the panel above and identified as item 15 in the reference photo.
     
     
     
     

Instrument Panel Details