Tank monitoring system

I may have missed this on the videos or other spots on the web site.

Dose PC utilize internal probes or exterior mounted sensors on the black, grey, and fresh water tanks?

I found this with a search in Tips and Tricks  http://forum.phoenixusarv.com/index.php/topic,432.msg2418.html#msg2418   

Okay thanks.  I am now assuming that the PC tanks used an internal "probe" (actually probably three per tank)
in lieu of the external (outside tank) mounted sensors like some winnies and coach house's use?

Probably.  As long time fulltimers using first a 30ft Airstream trailer, then a 40 ft Foretravel DP, we never relied on the black tank gauge and usually not the gray tank either; since both our rigs were purchased well used and the gauges never registered correctly.  Both rigs had a straight drop into the black tank, so it was easy to visually monitor when it was getting full.  Experience also taught us that when the toilet "burped" gas when flushed, the time had come.  We never let it go where any overflow happened.  We have had a few occasions when the gray water backed up into the shower (not much, mind you) when we were a bit slow on the dumping; but, none of these methods of knowing when your tanks needed attention was too hard to learn. . .it was all part of the RV lifestyle.  I can't speak for "weekend warriors" since after being fulltimers, we are now "sometimers" who stay out weeks and months at a time; but experience is the best teacher  . . .just sayin'.   

The tanks use probes and a non-digital read out. I asked if PC would install the Seelevel monitor as an option and the answer was no. I saw later that the black and grey tanks are wrapped in a foiled insulation and that probably would interfer with the way the Seelevel guage works.

Earl did confirm that the toilet on the 2552 has a direct drop into the black tank. In my current RV in which the black tank monitor no longer works, I use a combination of tracking the days since last dump and a look down the toilet when I am pushing the limit.

..Mike