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Here are some splashproof gauges that would work well in hard tank ballast systems. With a simple float type fuel gauge and a few resistors they would display the water level in your ballast tank.
http://www.lascarelectronics.com/pro...FTOKEN=6217594
They also make really nice digital voltmeter (and ammeter for that matter). These are very nice gauges but they don't have backlights. I had planned on using one of thier SP5-1200 with backlight but it's display disappears when you view it from above (it's designed for use in portable meters typicall viewed from below). The backlighting on the SP5 was a very ugly industrial green/yellow so I decided to skip the backlit feature. It's possible that I can rig a LED to shine through the mounting stud?
http://www.lascarelectronics.com/pro...FTOKEN=6217594
They also make really nice digital voltmeter (and ammeter for that matter). These are very nice gauges but they don't have backlights. I had planned on using one of thier SP5-1200 with backlight but it's display disappears when you view it from above (it's designed for use in portable meters typicall viewed from below). The backlighting on the SP5 was a very ugly industrial green/yellow so I decided to skip the backlit feature. It's possible that I can rig a LED to shine through the mounting stud?