The 126 pump system uses one line with vacuum one direction and pressure the other. Your system uses vacuum in both directions using TWO lines. I seriously doubt that the vacuum elements in your car could be made to function off pressure.

Non leaking systems hold vacuum indefinitely, days, weeks maybe more. The key to quick diagnosis is to remove the reservoir from thye system and put your gauge there. Without the reservoir the leaks are seriously amplified and can easily be seen on the gauge.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician