Why not just tee off of the oil pressure switch?
Other list members have made pressure measurements at this engine point and have concluded that the pressure and volume is not sufficient to solve the oiling problem. CAM CHAINS AND CAM CHAIN TENSIONERS, REPLACING It is not necessary to remove the cams for this, nor is it necessary to remove the engine from the frame. Changing cam chains is a bitch unless you use master link type chains, because you have to tear the engine down to the crank, and the engine/tranny of a V65 weighs around 200 lb. This is described in an article on the above web site.
