Railcraft Steel Tank Level Sensing

[Ashonee]

Looking for some help regarding running a liquid fired High pressure steam boiler connected to a railcraft steel tank.  This system will then power a Big Reactors steam turbine.

What I am trying to do is store fuel (creosote) in a steel tank until it is full or nearly full and then send a redstone signal into an RS-Latch to begin to pump fluid out of the tank until the tank is completely drained, then have a second signal into the RS-Latch to stop the pumping.

Anyone know how to get a redstone signal from a railcraft tank when full or nearly so and when empty?