yup... in fact there is a quick disconect that bleeds all the pressure out even if you doont push that little bleeder valve button.... and besides that, the gauge returned to zero every time i took the gadge off.....
but on the other hand,
i am no mechanic, and i have not preformed a compresion check sence highschool auto class.... but, i am confadent it was done corectly...
but i have ben wrong before