Hey all, I have a 70s classic, with a 73 Evinrude 85. The gas tank is a Tempo Long cruise 18 gallon black steel tank. All summer I had complained that there is NO way to tell how much fuel is left. No gauge on dash, and no gauge on the tank. I just took the tank out of the boat to winterize, and saw a grey steel circle on top of the tank. Out of curiosity I unscrewed the 5 bolts holding the circle on, and discovered that it was leading to a float arm with a float. This tells me that there is a way to hook up a gauge. How difficult is his to do? Any help would be great. Thanks.