Can you make it equidistant to the other sensors? I had that happen and lay on my back under the RV to find the spot and then sat up to reach it. I used alcohol to clean the space and Gorilla glue and temporary tape to attach. I was not too worried since those indicators never really worked anyway. It's empty when it stops draining.
33' 2008 National Tropical on a Freightliner chassis.RVM#189