Tank level monitoring

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Please report any success on the resistive sender front so I can shamelessly copy it !
I have been trying to accurately read a tank level/voltage using existing resistive fuel sender. 
In my case the old fuel gauge is broken so Ive setup a voltage divider using the 190 Ohm tank sender but my biggest problem seems to be getting a steady reference voltage to start with. 
Of course the boats 12v supply isn't very well regulated and even when I used a 10v regulator chip to supply the sender, that too seemed to suffer from variable loads. 
(My fuel, water and waste tanks are all metal so I actually have 3 resistive tank senders on this regulated supply and I guess that might be the cause)
All the best 
Steve

I built one using a plastic stick (the long bottom part of a plastic clothes hanger), and bare copper wire wrapped around it in four places. The bottom is the reference, the other three tell me low, medium and high level. It all sticks down into the water, mounted to the screw-top of my water tank. I used an Arduino Pro Mini and four LEDs. The arduino senses the connection through the water at the various levels. Very simple, and works great. I don't need to know more about my water level than low, medium and high.

Very simple, but I like simple solutions! If you wish to pass that information to OP, I'm sure it wouldn't be difficult to add some code to pass the data via firmata.