I think yours is mechanical.
Are you also running VMSPc? If the VMS and speedo agree then it's a signal problem. If the VMS and the GPS agree then it's a speedo problem.
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Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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