The gauge that looks like some bits of pencils attached to a bar , are used to determine the correct dipper height and trough depth . The large plate with the square holes has another plate underneath , that is not seen in the pic , that has a series of holes , that are used as targets for the oil flow from the tubes in the sump/troughs.Your garden hose is normally used to test the oil tube aglinement.
Sure are having trouble with the pics ,, I get a bunch of red Xs here ,, LOL ..
Edit ,,
Hey , thanks Drew ,, got all the pics workin' now .
Truckernix , the tubes are bent with a small tool , to re-agline them with the target holes.