I have a 3 move power chart for an engine ,you compare a torque reading ( Off a gauge ), with a temp and baro. pressure input correction , to compare it with a chart of exhaust gas temp of a Spec. engine ( what a normal new stock engine would produce ). I have it on a laminated card , one side column , a page of 400 numbers ,with same on the back side. Its the same as a diver chart if you have ever scuba dived. I would like to refine the interpolation , from - its like 257 - 262. Any ideas or links would be nice.