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Registered
Join Date: Dec 2011
Location: Virginia Beach, VA
Posts: 526
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While checking the wire connections, jack up the rear of the car and use a VOM to check that there are 8 pulses per wheel revolution from the reed switch mounted on the transmission. You can check this at the reed switch connector in the tunnel. There are 8 magnets mounted on a disk inside the transmission differential that actuate the reed switch when magnetic flux is present. If one or more of the magnets dislodges, it will cause erratic speedometer readings. I hope your problem turns out to be other issues.
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-Dennis
1977 930 Slant, MS3 EFI, Carrera intake, Twin plug, Powerhaus headers, Magnaflow muffler, Garretson intercooler, GTX3071R
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