Water Tank Level Indicator provides Water Tank Guages in Melbourne. A leading supplier of Floating Type Water Level Indicators in Melbourne.Nicko Water Tank Level Indicators has been in the water tank business since 1980. We are well-known for our high-quality water tanks and accessories. We noticed that the water tank level indicator market was not being served well and not meeting Australia’s needs. Something had to be done – and that’s why we are here today.