I need some help identifing a component in the dash configuration. I started out simply tring to install some front dash speakers and ended up taking the entire dash out once I got into it. I ended up breaking the gauge cluster plastic housing and had to replace it. As I'm putting it back together I noticed that I don't remember what was in one of the 4 small holes surrounding the speedometer. The two upper are the right and left turn signals and the lower right is the high beam indicator. The one one the lower left is a question. There is a dash bulb in the opening in the instrument cluster, however, I don't remember what was in front on the dash side. It appears to be open all the way to the bulb location.
What is it for?
Thanks!
Terry