OK, now for my pictures. The light was pretty harsh, so my apologies.
The air filter and oiler. This oiler has an adjustable rate and a reservoir that makes it easy to see how much oil is left. The oil drips into the air stream in the upper bubble, making it easy to gauge the rate that oil is being used.

The view showing the air lines going from the oiler to the compressor, and from the compressor to the condensor. The copper line near the radiator runs to the in cab pressure gauge.

Here we have the oil separating filter, upper right., with a T to the converted propane tank and the air line. In the middle, is the manifold, which branches to the pressure switch, pressure relief valve, and the guage line.

A different angle of the above stuff.
http://whipp.no-ip.org/gallery/albums/oba/img_2202.sized.jpg[/img]
My pressure guage (oil filled). It looks like the blinker knob blocks the view, but the visibility is really just fine.

There are a few more pictures here:
http://whipp.no-ip.org/gallery/oba- Craig