Regarding fresh and waste tank sender failures. I purchased a Hunter 290 last Fall and have verified that both senders are inoperable. I have seen posts recommending an externally mounted sensor system (WindRiver). This method sounds much more reliable, but requires mounting of a new gauge that does not fit in the old gauge location, i.e. square gauge in round hole. Additionally, new wiring is required. Does anybody know of a vendor that can provide either a round gauge system, or an externally mounted sensor(sender) that will work with existing Wema gauge? Does anybody have a success story in replacing gauge system they could share? My panel has precious space available and am not sure about mounting new square gauges and leaving the dead gauges in place. Thanks.