ATC bulb
 

Just found out that the Automatic Temp Control bulb is burnt out, broken or missing for a 76 GP. believe i have to take instrument cluster out to get at it . Would want to replace with led bulb. Would like to have in hand before starting so car does not sit idle for a few days why i find bulb. Question is does any body know size of that bulb. Since this is not in instrument cluster ,don't believe it a #194 ?. Thanks for help