[Tincan18]

I have a 1994 Mustang GT and i'm getting some horrible radio feedback I know it is probobly a bad ground from somewere i just dont know were and i dont want to start taking out my dash unless i have to. Does anyone know what it might be that is causing this feedback or to mabey look. Along with this problem my spedometer and RPM gauge is acting funny; sometimes it works and then it does not work at all? Any help would be great thanks!