The first thing you need to do is remove the dash and see if the panel plug is plugged in. Then you need to see if the cable is there for the speedometer and if it is plugged on to the speedometer. Check the fuse panel for blown fuses - and the common corrosion and rust. Make sure you have a ground wire from the battery negative to the engine and to the frame and/or the sheet metal (firewall or inner fender).

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Paul
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retired mechanic after 35 years
specialized in Holley carbs and Ford Automatic Transmissions