Foretravel Owners' Forum For owners and Fans of Foretravel Motorcoaches September 11, 2025 ...

When we bought our 1990 GV U225 a year ago the monitors did not work. We hired an RV mechanic to help us to no avail. We installed a new back-up camera and they hooked up the leads for the monitors but again, no luck.  It looks like a sealevel would work if the leads work but in our case, no dice. Has any ever used an external only system?  I found the Gobius online and although it is twice the price of the sealevel system, it appears to be very simple to install. As always, your feedback is much appreciated.

Amazon.com : Osculati GOBIUS Waste Water Tank Level x4 sensors measuring...


Leigh

Shop around. I got mine here, best price at the time.
Garnet 709 SeeLevel II Tank Monitoring System

also at Amazon

Amazon.com: SEE LEVEL 709: Automotive

My tanks are about  22" tall.  Yours may be different. Standard strips are 12".  You can order the kit with 16" strips or order an extra set of 12" strips and use two (trimmed) strips per tank or just order two kits with 12" strips.  Then you can have a display inside the coach and one outside in the wet bay which is very handy.

Three extra 12" strips cost about the same as an entire kit with a display.

You want the strips to start and stop 1 to 2 inches feom the top and bottom of the tanks.  You hit zero on fresh before you actually run out and 100% before you are overflowing.  Same on waste tanks.  Maybe even leave a bit more distance to the top of the tank for earlier warning sort of thing.

Do the prep work on the tank carefully and they will stick fine.  Preposition everything with painters tape to make sure it is where you want it before sticking it on.

I went with the iSeries Tank Monitor system.  It has worked flawlessly so far.  About $200 on Amazon.   It hooks up the same way that my Audit system hooked up with aluminum tape on the tanks and a sensor mounted to it. 

I went with Sensa Tank RV 100, they were my second choice. My preference was the Sea Level system mentioned above. Reason : when opening up the plumbing bay, I found my tanks to have reasonably accessible front faces, but they are angled on the front. in other words they don't rise vertically at 90 degrees. they rise at about a 45 degree angle, getting closer to the outside as they rise.
I called Sea Level, asked if their strips would read the tank levels properly if placed on the 45 degree face, they said no.. I called Sensa Tank, asked if their individual sensors would read properly on the angled face, they said Yes.
I realize if I had tackled removing one of the tanks, I could have placed the Sea Level strips  on the Vertical sides of the tanks, but that requires disconnecting a lot of plumbing.
I am very pleased with the Sensa Tank System. Downside it it only reads 1/4,1/2, 3/4, and Full
Amazon.com: Johnson Pump Rv Sensa Tank Rv 100 200600032rv: Automotive

I use the following Flush King to back flush the black tank at least twice with clean fresh water (with the clear coupling, you can see when the tank is clean) before using the remaining water in the grey tank to flush the black tank. Using the grey to flush the black you leave both dump valves open until the equalize.  Done this for over  10 years and keeps black tank clean.  I just am not a fan of equalizing the tanks until I've flushed the black tank using the Flush King.  I then use "Happy Camper" brand treatment.  I use to have my tanks checked by a franchise that did that with a camera.  After two years they said I was wasting my $$$ having them check my tanks in the future, as my tanks were as clean as any they see.  The Happy Camper product does not just cover up odor with another odor, it eliminates all odor with enzymes.

My sewer valves were just all renewed by the previous owner.  So...it will be a while before I install the 3rd valve with a black water flush system to allow clean water into the black tank.  A pair of See Level monitors will come first, later this summer, (one inside and one at the wet bay).
Amazon.com: Valterra F02-4350 Reverse RV Flush Valve: Automotive
Amazon.com: Happy Campers Organic RV Holding Tank Treatment - 64 treatments:...