Improve those dash lights

cannucky said

Another note on the bulbs themselves , I found the little wire paths on the bulbs are a little narrower than the brass clamps in some of the sockets so I bent the loose end of the little wire out towards the edge of the base making them wider ensuring good conduction . I'll take some pics of this issue when I find another replacement socket .

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you're not the first to discover the LED undersized at socket contacts. "Intermittent" / "Come and go with bumps in the road" reported here before.
About the speedometer, I don't know what panel you're working on but all speedometer heads are held in the metal housing with 2 screws, one each side of the cable port. Those screws go through a metal sleeve thingy that is in the middle of a rubber isolator, sort of like a front end bushing on much smaller scale. You might have a loose or missing screw, failed isolator, or maybe someone left out the rubber isolator pad between the instrument and housing and/or stripped some threads in tightening. So yeah there are 3 pieces of rubber along with 2 screws involved in typical speedometer head mounting. 4 pieces of rubber where there's a trip clock stem. Good luck with it.