Does anyone know if there is a way to tell if I have a regular D10 or is it some sort of industrial version with yellow paint under the orange?

I have a MF 135 special with Perkins gas engine, 12v alternator. I just have the two gauges (temp and pressure). I would like to upgrade my panel five gauges. How hard is it to convert? Aside from the gauges themselves, what other parts would I need? I know a fuel sender. It already has temp...