VPC Fiberglass offers two styles of gauges; options being a top mount system for the top of the tank or a side mount system for the side of the tank.
Each of those systems then get divided in a sweet service (water, wastewater or fluids that are allowed to vent to atmosphere) or severe service (harsh fluids or chemicals that are not allowed to vent to atmosphere). All the systems can be outfitted with level alarms to provide high level or low level set points if required.