Fuel hydrometer

Sounds good to me. I know in the early days they made 60 and a 70 degree hydrometer, so your chart had to be matched to that hydrometer. I made my chart on a weekend of Coors, hot ice and some nitro sitting in the garage. S&S had a pretty actuate chart but I believe it was for a 70 degree hydrometer. The one I had was a 60, the 70's were kind of hard to find. They were better if you were mixing with ice, didn't have to wait as long for the fuel to get to that temp. in the summer.