Calculating vacuum -- These numbers do not make sense

[Ripcrow]

Fixed I think. Bought a gauge that went as low as -100 kpa and it went well past that and hard up against the stopper at around where the -130 kpa graduation would have been if had been marked. Must have gone well past that level though as when I repeated the test the gauge only got as low as roughly -110 so I’m thinking the gauge was damaged in the initial test or it found a way to admit a small amount of air into the tank , perhaps through the pump seals. Either way it has proven to be more than is required. Thanks for all your input.