I need a little help. On my 55' second gmc dash, there is a hole directly under the speedo on the left and the blank GMC on the right. I saw a picture of these on another vehicle with a red lense in the left one and a green lense in the right one. What are they for, and why would mine not have the lenses?
The turn indicators have lights on them and as this was the first year for that option, are they related?
If I didnt describe it right, there is a pic of it in my " welcome " post from the other day.
Thanks guys.

"Upon the plains of hesitation bleach the bones of countless millions, who when on the dawn of victory paused to rest, and there resting died." - John Dreschmer