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Old 12-12-2012, 11:16 PM   #1
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04 GT Guages are Broken Help with swap

My Tach broke in my 04 Mustang GT If I pick one up from the junk yard will my miles swap over or will it show what the junk yard odo shows? I have a low miles gt and I dont want to mess with my resale value in a few years... I also read about some anti theft feature in the Guage Cluster?
Any advice would be helpful.

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Old 12-13-2012, 10:18 AM   #2
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You most likely would have to call.ford on this one... I'm pretty sure if u swap clusters it won't transfer. However u can just buy an aftermarket tach and mount it nearby just a thought

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Old 12-13-2012, 11:53 AM   #3
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It depends on why the tach is not working. If it is the actual gauge (which is just a stepper motor controlled by the cluster micro-controller) then you can swap the flexible circuit board from your old cluster into the new one and the accumulated mileage will go along with it.

However if it is an electronic problem with the stepper motor driver circuit then swapping the circuit board (which must be done for the engine to start--more about this below) will also move the problem to the new cluster.

Your '04 (and all '99 to '04 Mustangs) has the Securilock (PATS) type C system, in which the PATS module is integrated with the HEC (Hybrid Electronic Cluster) electronics and virtually "married" to the PCM via a shared security ID (SID) programmed at the factory. This is why you cannot just swap instrument cluster assemblies.

There are two workarounds. One is to have Ford dealer with the required IDS (Integrated Diagnostic System) module "marry" the new cluster and PCM--they can also set the mileage while doing this.

The other, which I do not recommend, is to have PATS disabled in the tune. The engine will start however odometer will display whatever mileage the donor car had accumulated. Further I had so many problems disabling PATS in the tune, ranging from occasional no-starts to being unable to reverse the change, that I will no longer do it and certainly do not recommend it unless one is feeling lucky that day.

One thing I would do before changing the cluster is to use the HEC self-diagnostic mode (click here) to observe the engine speed on the odometer display--this will assure that the PCM is sending that data to the cluster. If not the problem lies outside of the cluster.

You can test the tach stepper motor by using the "how to calibrate your gauges" procedure described in this link.

If the PCM is sending the data and the stepper motor checks out then the problem is electronic in nature and swapping out the HEC circuit board may be the only fix...
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