I would try for a new set of Yellow Jacket or Robinaire Gauges. I would then use the gauages at the local pawn shops in search of a good pump. If they won't let you test for at least a 29.8 vacuum go somewhere else. It is to easy to buy a bad pump (EBAY). I would like to have VSTECH servicing my truck 150 microns is very good.(post 7) Stay away from Harbor Fright (Chicom Crap) Good Luck.