93 Rinker fiesta Vee water/waste tank level indicators?

cdm0079cdm0079 Rock Island, ILMember Posts: 14
Hello both my water and waste tanks have two brass screw inserts on the exterior or the tanks. These are meant to screw in level indicator, but I can't find anything online in my search that will screw into these. 

They are very simple, and only will show when water is LOW and waste is FULL, or very close...

I'm looking for both the gauge and screw in electrode for the exterior... anyone know about these?
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