For a final check (inspection is coming soon), my gas pipe was pumped up to 15 PSI. Over two weeks the gauge has dropped to around 6.5 PSI. When I checked the first night it was still right at 15, and I think (?) a day or two later as well. Then I didn't check it so often. 2 days ago it was at 7.5 PSI. With such a slow leak I'm sure that it will still pass inspection (around here it just has to hold pressure for 15 minutes), but should I be concerned at all? Or is it probably not even the lines but the cheap gauge causing the slow trickle?