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Q: electrical short in dash on 1993 Cadillac Eldorado

This car is actually a Eldorado Touring Coup. If it was not in ultra premium condition, I would replace it. However, their is an appearent short in the dash. The speedometer races to 140 miles per hour just after starting. The mileage per gallon and range computer resets itself. And the a/c which is fully charge only works when it wants to. Also the cruise control comes on and then goes off when desires. i figure its either a bad relay or a malfunctioning computer. I am going to take it to the shop tomorrow. I dont want to put a ton of money in it. Any ideas whats going on? Time to park the old girl? she runs like a champ. 32 valve 5.7 litre engine, looks like new:)
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The Instrument clusters go out on Caddy. You can have it removed and send it to SpeedoTach in Concord CA and they will rebuild it for about $180. Not too bad when you consider that a new cluster is well over $1000 installed. I have done it several times at the GM dealership and at independent shops.
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