Hello, I'm Luis, new member,
I'd like to ask the experts, I'm confusing a bit, the last night I bagged off a part, small part, the temp inside the workshop was 20º ish, and I leave the vacuum more than 1 hour to see if  there was a leaking,  I fitted a vacuum leak detector from easycomposites, and doesn't show any changes over an hour, the gauge indicator was 2 marks closed to the full vacuum, then I went to sleep, this morning my surprise is, the gauge is far away from the full vacuum, I switched on the pump, there is no sight of leak and the room temp is about 8º, so could the temp are affecting the gauge? if that is correct how I have to deal with it? Thank you.

Assuming there has definitely been no leaks, then it could be a variation in atmospheric pressure.  There is a little rubber grommet on the gauge, gently pierce it to equalise the pressure between the gauge and atmosphere and it should be a bit more accurate. Be careful not to pierce deeply as you can hit the internals which would definitely knock it out of sync. 

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant