Re: Tank level gages 3712 hd
Hi Bigrigforus,
Welcome to the Heartland Owners Forum. You'll find lots of useful information here (not counting the dated coax drawing). You'll also find a lot of friendly people who help one another out.
Tank level indicators are notoriously unreliable, particularly but not exclusively) the blank tank. Some people have tried various ideas, but generally I would say that most people end up ignoring the guages. You'll get a feel for how frequently to dump the tanks, or you can wait for the toilet to "burp" and then dump it.