Thanks to a post from 7 years ago I finally found the unconnected white wire that is connected to Javelina plug connection 15. I can now attempt to recal. my 3 water tank indicators. Unfortunately I have spent so much time today that I must pick up tomorrow.
By the way there was another white wire that was capped that when I momentarily connected to ground it sparked. Oops wrong white wire. It has been recapped and that's when the correct wire popped into view. More tomorrow
I went through the complete empty and fill process with apparent success. In the process I found SEALAND toilet issues: vacuum breaker leaks and the flush valve may also leak into the bowl. This might be a job for the pros
Tank indicators now read acceptible levels and I replaced toilet vacuum breaker/spray hose.