Hey Bobby yes your right there may be an access point without having to drop the tank. You can check online at prevostcar.com under parts/service and go to Parts assist catalog put in your VIN and you can get a view of your tank to see where the sending unit is located. I'm not sure but you may be able to search there also to see if there is an access point either from second or third bays but can't be sure. The only other option would be to drop the tank. Do you have a secondary tank? I have the 160 gal and a secondary 90 gal tank.