well i tried in vain tonight to get a bike computer to read the magnetic pulses from 12v solid state fuel pump. the digital odometer would not follow the increasing and decreasing frequency of the pump consistantly when i varied the flow with a needle valve. i had the pump cycling on and off between 2 and 4 psi pressure. but when it turned on each time it had to make 5 or 6 thumps to catch back up to 4 psi. and the bike computer counted those 5 or 6 pulses as 100 or 120 MPH instead of the actually fuel being delivered which was 20 or 25 MPH. the other style pumps that are longer and cylindrical might pump more volume in one stroke an work better, also the pressure switch i was using had a 2 psi delta that i couldn' easliy narrow. with a 1 psi or less delta and a higher volume per thump and it might work.
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