I like BLing's Idea...Put in a ONE-Way valve on the hose going from the oil fill neck, so that the flow is OUT of the VC's. Then, put a filter to catch any oil..Then, connect the hose to the power pipe via a male air tool connector. This will allow air out of the crank, back into the powerpipe (air gets meter upon return) and oil to be observed and caught in the filter.
GREAT IDEA...Vib and I may do that.
RC