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On the engine there is a fuse box that will have a small fuse for the helm. This sounds like you have blown that fuse and the dash is not getting any power to it. Check this fuse and make sure that it is ok. If it is good. Disconnect all of the SmartCraft lines under the dash one at a time and check them for corrosion. Then reattach them. Test the dash. You may just have a weak connection as well.