We were told that Stewart Warner made an electrical gas guage that can mount to the top of the gas tank in a 3100? It suppose to be more accurate and the gauge would be hidden from view and not hanging under the dash like a wart. As we understand it the original sending units are not accurate and people have become frustrated with this inaccuracy. Sounds like a good idea? We have no sending unit in the tank and we have 6-12 volt conversion so it was suggested that this was a way to go? I'm not crawling under the dash, I'm too dang old! Right now we shake and listen and keep a log. Thanks Steve