Pete, you asked

<< My pump is working, as I posted earlier, but I noticed when the tank
had water in it, only the red indicator light was on even though the tank
was 3/4 full.  Is there any way to clean off the sensors?  Or, maybe
change them out? >>

   First off, if your indicator uses a float inside the tank, make sure
that it isn't full of water...

     George/ATL
     '89 WesTiico, Wernher