if I recall right, there's a hooded slot [a small louver] in the dash front just above the knobs where that light goes - it's like a "map light" or a courtesy light
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics