Grounding issue?

[rtairey]

I have dual Skyview with engine monitors with CHT and egt probes on a lycoming. When PTT is pushed , CHT's all spike up 50 degrees and go back down when PTT is released. I have audio alert hooked up to my ps ENG'g audio panel but have them grounded together as suggested, any opinions?

 

[JTD]

Call Dynon support and get a return authorization number. They have a hardware solution that will fix. Had to send mine back for exactly the same issue. Work great now