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I have an RV-12 with a D-180 and Rotax 912ULS. The CHT's have started fluctuating from a low of 180 all the way to the alarm temp past 230 and back to +/- 180. I've checked the wire connections and ground, but the problem continues. It occurs after the engine has warmed and even occurred once...

I've been having the same problem recently with the fuel flow.  I've adjusted the "k" factor up and down with not much change in the outcome on Dynon fuel used vs. actual.  I'm going to incorporate your solution above and see how it comes out.  thanks for the troubleshooting.