Here's what the backside of the dash where the instruments are located looks like. The center hole for the speedometer still has it's mounting ring and studs. The two instrument gauge holes were enlarged and the mounting rings and studs were long gone when I bought my truck.
Good progress. Made the "clamping" ring for the new SW surveyor speedometer. The new Wings SW gauges are a step closer. Cut out the back of the stock gauge, removed the stock gauges. Used the 1935 bezels & glass, I then reattached the modified stock back of the gauges. I hot glued them in place.