Fuel gauge

[hookset]

Ok so let me start by saying I'm the paranoid type with running out of fuel, half tank means better fill up!!! The fuel gauge on my 1996 is inaccurate like most! I have a 100 gal tank and when it says half it takes anywhere from 37 gal to 65 gal. I have heard they make a laser fuel gauge for boats to more accurately tell how much fuel you have left. I haven't been able to find any online and am wondering if anyone has heard of them or can give me an idea of a gauge that is a little more accurate! Looking to go sharking more next year and knowing how much fuel I have could be one less think I think about while out there! Thanks in advance