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You need a set of a/c manifold gauges. There are sets for R12 and 134a.
You need to be able to open the system to the gauge and close the system.
If you don't have the right equipment, don't even try reading the pressure.
You can pick up a set of 134a gauge at Harbor Freight or Ebay. Use set of r12 gauge can be found on eBay.
Best tester for finding leaks is the electronic sniffer.
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