The cluster is out, you won't believe what I found

2nd look, it appears I am missing the oil light bulb/holder. With a holder being gone, would this cause any issue with ground or the operation of the other lights? Why is the oil bulb linked to the other cluster light? if one goes on, the ohter would also go on? Pin 2.

Who carries these lamp holders?

p.s. I soldered cables to everything, connected it, and still not getting gauges. I test temp send unit, and giving me 5.3v, consistent no fluctuating. so now replacing voltage limiter. I f I can just get the gas gauge to wake up, I would get a mini chub.