Lights flicker and gauge jumps around???

TrailBeast said

That's because some of the factory designs work poorly.
Especially after all these years.

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Do what you like, but when you do your own engineering, you're also on your own when things don't work as you expect.
Taking care of things and understanding how they are supposed to work is just too difficult, just spray a bunch of new at it, that'll fix EVERYTHING!