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It could just be the Tach is going bad on it. The Cluster gauges going bad is a common thing. I would just look into a Junkyard, grab another and try that.
My tachometer quit working as well. I too have a 94 dakota. I took the cluster apart and the tachometer is like a plug and it just comes right out. Would I need to replace just the tachometer or the entire cluster?
Just the tac. The tac on my 90 has not worked for a year or more. My question is, is it the tac or is it a problem from the sending source. Please post the outcome if any of you replace the tac.