Spend your money on a quality gauge, I like longacre myself, not because its accurate, but because its consistant. Then always use that gauge, always use a log book, and don't beleive the guy next to you when he says to run ## pressure. Trail and error and a gauge that gives consistant readings will make you faster.
ps: for you smart asses, by consistant, I do not mean a gauge that will always tell you your pressure is 15 lbs.