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03/04 cobra gauge clusters dont work on gt's by just plug and play. you gotta have the pats recalibrated or whatever. its the only way they will work. you cant swap the circuit boards like you can with mach 1 gauges etc.
^+1 i say sell it and buy a mach, besides that way the redline won't be off.
+1^ but try to find a cluster out of an auto mach 1 or a bullitt because they have the same redline as gt's, but 5 spd machs have the same redline as 99/01/03-04 cobras