It's actually really easy to do. Practice on a garage sale jack. I did mine for my press, but didn't take pics. Dis-assemble the jack. After drilling out a small bore in the side of the base for a 1/8" pipe fitting, I used the second smallest drill in a std index to drill a small passage to under the ram cylinder. Then used a bit one size bigger to drill down from the ram cyl floor to just intersect my drilled passage. Hardest part was the layout to not weaken the jack base. Yes you need a 10K PSI gauge & heavy wall 1/8" pipe fittings. My cheap POS 12 Ton press jack will put out 8500 PSI. If you mess up & really weaken the jack base with the small drilled passages, I doubt that it would fail catastrophically, just crack and leak.