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We don't have an Octane, but our TT has two FW tanks also. Twin 42 gallon tanks + 6 gallon WH= 90 gallon capacity. When we're filling ours, it goes into the front tank, and then to the rear via a hose just kike the fill hose. If I remember right, the equalizing hose attaches at the lower edge of the tank sides, so you're actually filling both tanks at the same time.
Our sensors are only on the front tank. If we fill it too fast, some water will start to come out of the front tank overflow before the rear tank's filled. We have to give them a little time to equalize to be sure they're both full. Yes, the monitor panel indication is for the whole 96 gallons
Yes, the two valves are really tank drains. One for each tank. The other two hoses are more than likely the overflow lines, one for each tank. If you fill them to capacity, water should come out of both, and will run for a minute (if you're level) until the excess water pressure in the tank subsides. We did install two 1/4 turn valves on the ends of ours. Just have to remember to open to fill, close, open after levelled up, and open again for water pump use.
The tanks are very wide and shallow, so anything off-level will allow the water to come out of the overflows.
I hope I've answered some of your questions without being confusing.
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