to summarize so far we have found that some Zemco flow meters are still on ebay and selling for $25 to 30. the output is frequency proportional to fuel flow.
dcb
has found a circuit diagram to convert pulses from a flow meter to a bike computer for measuring mileage on a carb'd engine.
http://diverse.freepage.de/cgi-bin/f.../fuelmeter.htm
also a site showing a bike computer displaying mileage.
http://11109.rapidforum.com/topic=11...6&search=sigma
This makes it possible to measure to mileage of a carb'd engine for about $100 to $120. which is still above our price goal.