Welcome to the site Kevin..
Coupe? Sedan?
Main ground should be near the starter. Looks to be a couple of other connectors in line that carry the ground, and a group splice but doubt the splice would be the cause.. If it were out at the starter, think there would be more issues other than the speedo and horn involved.. Sedan appears to have a joint connector that contains the ground for the cluster out on the left fender apron behind the Constant Control Relay Module, but being a joint connector would affect multiple components like fuel pump, cooling fan ect..
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05 F250 C/C FX4 6.0
1969 Firebird Trans Am
2003 Hayabusa GSXR1300
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