Elmo89m - turn it up until you get a good signal to whatever you're recording to. There is no one-size-fits-all position. What kind of pre are you using, anyway? What are you recording onto? This kind of detail always helps when asking this kind of question.
Cellardwellar - LOL! Nigel Tufnel would be proud of you!
If you are recording to 24bit, having a signal that's grazing the 0db "clip" line probably isn't necessary. I usually set my gain by playing the loudest note I plan on recording and tweaking the gain so that it's peaking at about -6db on the meter.