Just went through a similar issue. Pull the battery cables for a few hours. Pull a part the instrument cluster/gauges and disconnect the cluster. Blow out all connections. I also disconnected and reseated all PCM connections. Give this a try first.
2010 JKU. 3.5 RK Flex, 37" Nitto Trail Grappler MT, Method 105's. Poly Drag link, Fusion 4x4 Tie Rod, DIY Hydro Assist, Ultimate Dana 44 Front, Rubi 44 Rear. Ten Factory Chromoly Axles, EVO RockStar Skids 5.13's, VKS Shorty V2 with Warn HS9500i, EVO rear D-ring mounts, VKS Prerunner Sliders, Synergy Cage