I could see you maybe setting 1 timer for one tank of fuel and one for the other one. But i have never yet seen anyone remember every time to swap the timers over. Personally I go for the top part of the hour is on the left tank and the bottom the Right tank.
O well each unto there own.
Personally a Citzen eco drive with 24 hour hand for zulu is my timing device of preference in light aircraft. Zulu hand is for work.
Usually the students that go for the really fancy stuff manage to cock a perfectly good Nav sortie up by fannying around with there timer thingy. Turn time twist turns into Turn, fanny around for 3 mins with the timer and twist and then wonder were the hell are they as they have wandered off by 45deg's while fannying about.