Gauges in 1987 760 Turbo

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I just bought a 1987 760 Turbo. I was working on the battery terminals and when attatched the terminals and started the car, the temperature, battery, and gas gauges quit working. Turbo and tach is still working. I'm thinking I blew some kind of fuse or relay, but can't seem to find it. Any help would be greatly appreciated.