Rev and speedo needles going up and down

[Slaninar]

that sounds like a loose/corroded connection,have a look at all the connections make sure there clean and secure 

I checked them just this morning. Plus (red) wire on the battery was a bit loose. I screwed it in tighter. I also checked all the cable connections and fuses. They looked clean and tight, so I just put some WD40 and connected them back.

Will take it for a test ride and see what happens.

Anyway, since it is happening occasionally, it should not be a mechanical problem with speedo on the wheel, right? :/    I did open, clean, put some lithium grease on that, but I couldn't have broken it, it would have just stopped working at all?