Let me ask a dumb question. Is there a light behind the A/C & heater controls inside the cab? Mine is out & I'm not real sure if there was a light back there or not. I drive the truck mostly during the day & I did a night trip, I thought when my headlights are on, there should be a light behind the temperature control so you can see where the dial is. If so, what type of light is it?

 

yes there is a light bulb back there
same type as the rest of the dash

 

I think its a 192 but its been many years since I did them.