On 07/03/2015 10:53 AM, Dave, I can't do that wrote:
....
It is pretty common for the water to wear a hole in the lowest pipe
about 10" above the pump connection. ...

I'm like Lloyd--whassup w/ that!!!????

I'd fix the problem, not monitor the symptoms.

But, as another one or two said, to monitor the pump what you really
want is simply a run-time indicator.

--