<strong>Yahoo Message Number: 79562</strong>Hi,<br/><br/>Been having a small issue with getting the black water tank level gauge to read properly above 50. I gather sludge has been building up in and around where the gauge strip has been installed causing erratic readings. We used Aqua-Chem, Thetford's level gauge cleaner and the proverbial "douche" rod to facilitate cleaning and nothing seems...