#1
Hi, I can't get my intonation right on my Epiphone Les Paul-100. I got all of the other strings except for the G-string, but it just won't get right! When I pluck it with a tuner, the tuner goes crazy and says a whole bunch of random notes and the line goes everywhere, i'm not even plucking that hard. So anyways, I sometimes manage to get the G in tune, but then when I play the 12th fret, it sound kinda bad, like pretty off. I tried adjusting the intonation, and I even went as far as both the limits on the saddle.

Please help?
#2
try pressing on the string a little harder [firmer]

and maybe try some new strings because i've had bad strings that have done similar things
#4
maybe try reversing the saddle
like.. the part that holds the string
also ur suppose to wait a second for the tuner to get home in or whatever and the the string calm down
u cant just assume its right right after u pick the string