Snake River
I have used both the two tank monitor version and now the ultra 8 version. I had one of the first sending units that went into a metal tank and it worked perfect. Great people to work with and a good product. Would be glad to sell you my old two tank panel for a fair price. It is a special version of the four tank panel. It is marked for a waste tank and a water tank. I changed to the ultra 8 version when I changed to a larger holding tank. The old unit has Empty, 1/4 Full, 1/2 Full, 3/4 Full, and Full. If your tanks are 15 gallons or less, this is fine. However, when you go to 25 gallon or larger tanks, then you need more points on the scale.