Hi guys, I took my 74 Satellite out for it first drive on the road. The speedometer was very bouncy at first and then at higher speeds ( approx 40-50mph) the bounce became worse much worse fluctuating between actual speed and pegging the needle, along with a whriling noise. Once i got it home and disconnected the cable but the speedometer was stuck reading 10 mph. Is there any thing i can do to fix it, or do i need to find a new gauge? I have the rallye instrument cluster. Thank you guys for the help.