Well... since I don't care what the tank level is if I am not at the trailer, I use the monitor inside that you can use to check either tank. I have had the unit installed over a month, and so far it has worked as advertised.
One thing that is somewhat necessary is a dab of silicon dieletric grease on the contact point of the sensor. I just hope the battery life is good. Anyway, I am happy with the product.
Jim