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capacitive fuel gauge for petrol

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angus:
Been looking into this more couple of the commercial versions of this seem to use a second capacitive tube as the reference... same dimensions but obviously no holes to let the fuel in
This is easily done for me mechanically, and would obviously keep the ref at the same temp and therefore the same amount of  drift
Thoughts?
This probe should be useable even if the arduino circuit proves unreliable

hermetic:
  KIS?

angus:
No room as its a baffled tank, too deep for the swing on a conventional sender

awemawson:
JCB 803 sender is a long thin tube giving a varying resistance so should fit i'd think but there must be many available in this  style

hermetic:
Right, now I see the problem, I have seen one with a float that rose vertically on a shaft, twisting the shaft as it went, and operating a variable resistor, what about a vertical tube with reed switches inside and a rising magnetic float. alternately, could you not take a tapping from the bottom of the tank and read pressure  as contents? I am intrigued, what sort of car?

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