Sounds like you have a bad ground.
The radio might be a seperate problem.
I'll bet where the negative battery cable grounds is not a solid ground.
I ended up mounting mine under the air breather to the engine itself.
There is another ground that goes from the transmission to the body, and
that very seldom is the problem, but the fluctuating gauges goes hand in
hand with a bad ground, as does a dead battery after ya drive it, if that is
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