I found and fixed the freon leak[i hope].I am using Yellow Jacket guages made to read R-12,R-22,and R-502.At 2000 rpms i charged system using guages and sight glass.When sight glass was clear i stopped charging and the guages read 30 low and 166 high.At idel 650 rpms guages read 50 low 158 high.Acording to Ackits R-12 chart and the info i received from this forum,i should be getting readings around 30 low 250 high. I am reading the red R-12 area of the guages,should i be reading from the larger black numbers on the outer area?