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you must the VOM +logic sense for troubleshooting. 1) check the connector for proper installation and corrosion. 2) check the wiring circuit for any shorts or open. If this test do not isolate the problem, the speed sensor will be tested, and depend the sensor your have. Most of them use magnetic pick up : use jumper wire put the ignition in RUN,this will cause to Odometer to change.if there are NOT change the sensor is faulty. However you can run the scanner and computer TEST, for bettr result. or you can go to www. autoelectronico.com this web is spanish translate, i strong recommend you by powerful information update complete, you can download diagram etc, in PDF, try it and fix i.t God bless you
have your fuel pressure tested as the fuel regulator can be defective this regulates the fuel pressure in the system. check that the return fuel line is not blocked. disconnect the cold start injector when starting and this ilimunate over fueling non start up.
I have the same problem with my 300zx currently. You need to replace
the gauge cluster. The speedo itself in the cluster is really expensive
and hard to replace. Look for one on eBay. Make sure to get the correct