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Registered
Join Date: Jul 2015
Location: Jacksonville, Fl
Posts: 1,264
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I solved this problem (and a bad signal from my 915 tranny) by installing an AutoMeter GPS Speedo Sensor that is easily calibrated by hand. Its DOBA.......Dead On Balls Accurate. 
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Chris - Insta @chrisjbolton
1975 911s Insta: @911ratrod steel wide body, 3.6 conversion
1989 911 Carrera 25th Anniversary Ed (5th from the last car to ever leave the original Porsche factory assembly line)
2001 996 Turbo - ~54k miles
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