And that is why they don't put a hole in the tank, if they did then you would have to get the old sensor out. But this way you don't need to, but you can if you want.

I would rather see them include a new sensor if it's really that difficult to get the original out, but at least the tank seems to have been designed with the sensor in mind

Thanks for starting this thread. It was a good sanity check for me... I went ahead and hole sawed the bottom of the reservoir and installed the original sensor. It works great but we had to apply a little calk to keep it from leaking (the grommet was weakened from removal). The original sensor and grommet were removed with as much care as possible. We sawed the old reservoir in half to reduce the likelihood of damaging the sensor and grommet during removal.

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