Broken tach

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Subscribing.

To me this happens only now and then.

For the last few weeks my tach needle sometimes jumps up to just above 4000 rpms and stays there.
Sometimes it drops down after a while and acts normal all by itself - or I have to stop and turn the ignition off and then its fine.

Anyone?
 
Unless you have two years or more of electronic experience, all you can do is swap out the Tach. There is a circuit board with transistors, resistors and capacitors all soldered in place. You need to be able to troubleshoot the electronic components to fix it.

The following is a typical Ford Tach diagram.
42150d1138455782-factory-tach-speedo-wont-work-ford-tach-300-50-.gif