Two fuel senders in series

[davepl]

I was just thinking, since fuel level senders are ohm (resistance) based and higher ohms means more fuel, couldn't you in theory run the senders all in series, and it'd tell you what the total level of all three tanks was? If you had two half tanks, it'd read full. A quarter and an empty would read the quarter.

When all were full you'd have 270ohms and the gauge would read about 1/4 way past full, based on seeing it open in the past.

I imagine people either only monitor the main tank or, if fancy, have their switch also switch which sender to read. But on paper it'd seem to work.