My ebay acquired AS186 appoears to work fine regulator adjusts pressure etc but gauge does not appear to function correctly.
With no air in the system the gauge always indicate 30 psi, in use pressure build up no problem to 57psi and then shuts off as it should
So in essence when the gauge should show zero it actually reads 30 psi with the whole system discharged.
Am I missing something obvious or do I have a malfunctioning gauge or pressure switch?