tachometer problems

2005 FORD MUSTANG
V8 • 2WD • MANUAL
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JOHNFUN
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  • 1 POST
Hi, the tachometer on my 2005 mustang GT has gone haywire, up and down for no apparent reason. What can be the cause?
Thanks a lot,
Kind regards,
John Fun
Mar 15, 2011 at 6:59 PM
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CUP1981
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Hey John--

It could be a few things. The first thing to check it the RPM input signal via a scanner. This will tell you if it is a sensor on the engine, or the circuitry in the instrument cluster.

More than likely, though, you will find it is a failed engine sensor. If it is not that it is either a bad ground wire or a failed instrument cluster.
Jun 15, 2011 at 3:28 PM