New member needs help with efi conversion

I recently converted a 69 Convertible from a 6 cylinder to a Ford Motorsports 302 EFI engine. I am having a problem getting the gauges to work at all. The specific gauges I am having trouble with is the Oil Pressure, Temperature, fuel, and Ammeter. The computer I am using is from Speed and Performance and they state it is from a '91 Mustang. Everything else seems to work fine but it seems I have lost power to the printed circuit board. Any help you all can give a new member will be appreciated.