I am having similar gauge craziness on my 987. Factory manual and Durametric with no clear answer.
"communication problems" is about as clear as I can get.
Let me know if replacing the cluster helps.
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2005 987 - 112K miles PASM + 6-speed - Daily Driver
1988 944 - 240K miles- Race Car
1974 911 Targa - new project
2009 Triumph Street Triple R - 27K mi - Blazen Orange
1976 Ford F250 camper special - tow vehicle
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