For our group's Arrow 2:
1) Dip both tanks with a purpose made calibrated wooden dipstick (painstakingly made by measuring from empty to full tanks by a group member ) before every flight.
2) Take said dipstick in A/c and dip before takeoff at every stop and after every fill-up if only taking on part fill of tanks.
3) Right hand side of watch minute hand for right tank, left hand for left as mentioned by other listers.
4) Fill up at every opportunity.
5) Assume 10 Imp gall/hour and lean wherever possible.
6) Never fly a leg longer than 2 and a half hours (endurance is 4 hours)
7) Try to equate gauge readings with what the dipstick has just said to build up a mental picture of just how inaccurate the gauges are.
8) Dip tanks at end of every flight and post on Internet booking system for the benefit of next user's flight planning (We don't have the luxury of fuel at our airstrip.
Safe flying, and I'm glad the Seneca chap got off: The judge clearly had information we are not privy to, making a conviction unsafe:
So to all the barrack room lawyers on this forum: knock it off and discuss something else.
Ducks.
Cusco.