Engine shuts down when i tap gauges

The previous owner installed new gauges in my 236 captiva with 454 mag. I tapped on the water temp gauge (diagnosing different issue)  while running the motor on muffs and it shut down. It won't restart until i tap the right spot on the dash. Which gauge would shut down the motor like that? I did have a mysterious shut down problem last season while underway. Could this be it? 


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