fig1 13 with the additional steps illustrated in table 2 however the steps outlined in table 2 are added prior to the pressure test step the first step in making a dual tank unit after the steps outlined in table 1 is to cut off the oil portion of the finished tank the unit is then cleaned out that is both the front portion and the rear portion are cleaned out a side panel is then cut off the rear or oil portion to provide for a recessed panel holes are drilled in the recessed panel for return oil fittings and the return oil fittings are positioned and tack welded onto the recessed panel the recessed panel is the positioned in the side of the oil tank portion and tack welded in place fitting holes and an oil cap hole are then drilled in the oil tank portion next a breather tube is positioned and welded in place on the inside of the oil portion next plates are welded onto the two portions that is a rear plate is welded onto the gas tank portion and a front plate is welded onto the oil tank portion next the two portions are welded together note that there are two plates or panels that separate the gas tank portion from the oil tank portion following the welding of the two portions together the recessed panel is welded in place and the fittings are then welded in place in the recessed panel next the fittings.