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For you frugal guys, like me, here is what I used.

The gauges were 2 for 9.99 delivered from Ebay. The nylon washers were about $0.55 at Lowes. I removed the original washer and put just the nylon one in and the gauge so that it would flatten it and push to all the way to the sides. (it's slightly smaller in diameter) I then removed the gauge and dropped the original seal in also. Gauge sits in the perfect position and it appears to be holding air. (3hrs now and hasn't moved). No signs of any bubbles using Snoop Leak Tester.
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