I need help Please

[93blkz28]

Ok so I have a new problem.
So my car runs absolutely perfect but my rpm needle started jumping tonight.
it does not effect the way the car runs but I can't visually see what rpm I'm at because it just jumps/wiggles between 0 & 2xxx.
Oh & my check engine light is not on & I know it works because it flashes on start up.

[95ImpySS]

Sounds like your gauge cluster may be on its way out.

[Fastbird]

I see you're a 93. Did a later gauge cluster get swapped in? Do you have an ignition box on the car? Is the tach filter still in place?

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[95ImpySS]

Is the tach filter still in place?

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Is that the little black box on the harness that all 93's have?

[Fastbird]

yeah, right by the coil grounds.

[93blkz28]

Thanks for the replies 95impySS & Fastbird.
Today my problem went away but im sure it will come back.
So I got the car last September but the tach seems to be the original, I don't have an ignition box & my tach filter is still in place.
I forgot to mention last night was the biggest rain storm in my area this year & I was driving in it when my problem began.
I avoided all puddles so if anything got wet I'd be surprised.