I second Pointer. Aim at the red channel marker coming out and wait for the pucker factor as you watch your flasher go from 25 to 3 and then back down to 35!
Ranger, I understand the pucker factor, there are a lot of places that I run in the winter and as long as the water isn't lower than ~677 I still have two feet but I am always thinking that there will be a rock/stump that gets my lower unit. I always pucker until I'm past those areas.