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Euc? Do you mean ecu, the computer? Don't think so. Something in the cluster, maybe the little voltage regulator on the back of the cluster. But if the engine light is flashing, definitely have it scanned for trouble codes, first, to see why the light is on. The light may indicate a poor link or connection with the cluster.
If the trouble with the gauge started after you worked on it then you likely damaged or created a restriction to the movement of the sending unit. You will have to remove the tank and double-check your work.
weird...first thing to do is get a scanner hooked up to see what caused the check engine light-free, at pretty much any retail auto parts operation-i wouldn't get overly concerned with the gas gauge right now, teh code that tripped the check engine light might explain that problem.