Holding Tank Sensor Wiring...anything on inside

[IchLiebeBier]

All,
I'm getting ready to install a quickie flush system on the black and grey water tanks. I won't be able to install the black water flush on the opposite side of the drain pipe, so I'm going to have to install it either on the same short side where the drain pipe and sensors are located, or along the long side. I'm planning on doing it near the drain pipe/sensors.

Everything I've read leads me to believe that there are no connections of any type between the sensors on the inside side of the tank. Therefore, if I drill between or near the sensors, I should not hit anything on the other side.

Is that a correct statement, or are there some sensors that connect on the inside?

Thanks.