i drilled into the last oil post on both sides then tapped a 1/8 npt into the oil ,tapped out the inner of the elbow to 1/4 drilled 2 grubscrews to .040 thou loctited into the hole took a bit started at 1/8" & worked my way down connected a T piece to the rear oil port ,Iused the front oil port to monitor oil pressure see below giving a test run with carby .1st 1 is R3 2nd is Kent Ritter