The best guage I've found is the eye-ball guage. Look down see floaters time to dump. Washin the dishes and the sink dont drain, time to dump. Of coarse the one draw back to that method when taking a shower and the shower starts filling up, the neighbors get a laugh when I run out with the towel wrapped. Dang !!! this is not a cold weather option.
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2008 MS 4212 2007 Freightliner M2 MountainMaster..2012 Victory Cross Country behind the cab. 2011 Honda Fit pushing the FL and the MS
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