In the end the system went only 1 1/2 days between evacuation down to 28 and charging. And since this was not a top-off but a fill from empty, and since I had the exact amount of R12 in cans that the system calls for, "I donīt need no stinking gauges." Plus my system has the added advantage of an over-pressure switch mounted at the receiver/dryer, wired between the compressor clutch and the power source. I did, however, need to have an electric space heater running inside the car to keep the compressor from cycling. It was a cold day in Cincinnasti.

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