Tank sensors drive me crazy. This is our 7th rv. We have the tank sprayer but the installed it in the opposite end of the tank versus the cleanout. Works fine for cleaning the tank but the spray would not reach the sensor.
Solution was to add a second sprayer very close to the sensors. I use a quick disconnect and the onboard faucet to switch between the two. Our toilet has an electronic sensor and will stop flushing if the sensors are not clean.
It would be easy for a mfgr to install dual sprayers. Sure saves water.