It reads as if you need a manual and a little professional help. When you cut a pressure line you need the proper tooling to flange the line, install fittings, prevent leaks as well as trying to prevent contamination of the hydraulic system. (You do not want to introduce any metal filings into the hydraulic system!) There may be a system to tap into the hydraulic line I don't know, but sometimes professional help can save you money and time in the long run.