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Message: <blockquote data-quote="Mustang5L5" data-source="post: 1541916" data-attributes="member: 30520">The main wiring difference i've seen between 99-00 clusters and 01-04 clusters is Ford put the defrost circuit into the 01-04 clusters.  When you hit the button, it sends a signal to the cluster which then outputs on a different wire to activate the relay.  This is not present on the 99-00 clusters.  SO, if you mix the generations up, it may cause an issue with popping fuses or having the defroster be on 24/7 even with car off.I think this issue is a concern for 01-04 owners installing a 99 cluster. I beleive the pins on the board are a ground which shorts it out and causes the relay to be active.  99-00 owners can likely use 01 (or maybe even 03/04 cobra clusters) without issue.But i think a good rule of thumb to use is for 99-00 GT owners to seek out a 1999 cobra cluster, and for 01-04 owners to use an '01 Cobra cluster.   This ensure the defrost wiring is fully compatible with the cluster.How can you tell the difference between the '99 and '01 cobra cluster?  Well the warning lights.  Specifically the far right light.  On 99/00 cars, it says LOW COOLANT.   On the 01-04 cars, Ford changed it to CHECK GAS CAP.   So this is what you will want to pay attention to to identify the year of the 99/01 cluster as they are not the same.I actually don't know what triggers the "check gas cap" indicator light, so I assume this will not be functional in 99-00 cars. More reason to just get the correct cluster for your year span. 99-00 Cluster wiring[ATTACH=full]33994[/ATTACH]01-04 Cluster wiring:  Pin 8 & 9 on right plug are the added defrost logic, and pin 17 on left is deleted for the low coolant[ATTACH=full]33993[/ATTACH]</blockquote>