It says that's for all cab tractors (from the 1086 I&T manual). Who knows.
I don't think I have a charge light but I do have a coolant light - for level not temp. There's a sensor at the top of the radiator tank. The light is in the same light as the clutch pressure dump light.
Do you have the cluster of four gauges you can pull out individually? Temp upper right, fuel lower right, volts lower left, oil upper left?