>Gears and Wears>Pace bracelet
I find myself running by perceived effort. Typically, the pace takes care of itself. Just my $0.02. Good luck this weekend!
I just thought it was a neat (free) tool that some people may find helpful.
Run to Win25 Marathons, 17 Ultras, 16 States (Full List)
Running the 2016 Boston Marathon for Children's Hospital
I think pace bracelets help the most by keeping people from going out too fast in a marathon.