1970 CB450 K3 - Bringing it Back project

I found some time to take a look this weekend.

First, I happened to notice the bulbs within the left speedometer dial were dangling down, and when I pushed them up, the headlight and rear came on!
Further attempts to figure it out failed since it they dropped off shortly after when I tinkered more, but the fact it lit up tells me it must be some sort of grounding issue.

Can anyone define how those are supposed to be connected in and grounded? Both the left most and middle in this picture were hanging down, and both have electrical tape to make them fit in the holes better.
Do I have too much tape on them perhaps? The rubber plugs arent working any more to hold them in

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I also noticed some (oil?) residue on the left side of the engine I hadnt seen before. Not sure what this indicates
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The plugs look good to my eyes. As one might hope, and neither rich nor lean, but I'm much of a noob and you can tell me otherwise
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