Instrument Cluster Flex Circuit Shorted - Repair/replace?

I don't think that it's a given that the speedo won't work correctly if you swapped over the flex circuit. There aren't any chips on the circuit that would change the way the speedo reads.

The bigger question is why the thing fried as it did. Something is possibly shorted (one of your gauges, a light bulb) and you'll want to figure out why it burned up to avoid a new one burning up again. That wire itself isn't the cause of the fuse blowing (unless it's physically touching to a grounded surface).

If you want to attempt a fix, I've had success using a bottle of that "rear window defogger repair" paint. Scrape away the bad stuff and some of the insulator over clean wire, and paint between them. Afterwards, test the cluster and insulate with some tape or some plasti-dip if you're feeling fancy.

I agree with Joz. The problem might be in the speedo. If you can repair it on your own then surely you can or else you can take help of the professionals like residential electrical upgrades NJ. These people have better knowledge related to electrical panel and circuits, thus, can give you better suggestions.

Well I've owned a 94GT for 17 years, been on this forum for almost 20 years and this is a first that I've seen that one area on the cluster burn up like that.

I can't recommend getting just that section fixed without having to go buy a new cluster but you may want to go buy a lottery ticket.