Okay, so I installed the heater core today and wired it to a spare dash switch after all. I am using my old Gravity I ballast three position switch as I am not using it anymore. I ordered a faceplate for it so that it will read "Heater" on the switch, then "High" in the up position and "Low" in the down position. There are two indicator lights - one for High, and one for Low. Anyway, it's working fine except that when I flip the switch to High or to Low, both indicator lights come on.

So does anyone know what I need to do to fix this so that only the correct indicator light comes on, not both?

Thanks,

Al