Well, the EGR is probably sticking, not clogged, the code shouldn't pull your chain, it's usually right.

The EGR is going to be from $100 to $125 depending on engine size at your local dealer and if the car is high mileage, consider changing the gaskets for the EGR too.</P>
I don't think the Gauges have a connection, but maybe there's a lose wire, that's semi common, and if not, the cluster may need replacing...

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I hope this kelps!</P>
~Amanda</P>