Vacuum Pump recommendations

I called Total seal and they told me the low tension rings would benefit from a vacuum pump. Tim from Star called me today at the track and said basically I need to verify the engine is sealed. Pressurize the crank at 3 to 5 psi and look for leaks. Soapy water if you can't hear the leaks. Thank you all. I will get there . And the chassis certification guy showed me all the reasons that he could not certify the car. Very nice of him to take the time and not charge me the 205 bucks. Thank you Division 1 cert man!!!